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Fixes a compatibility issue in OSPFv2 PtP links.

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BIRD used zero netmask in hello packets on all PtP links, not just on
unnumbered ones. This patch fixes it and adds option 'ptp netmask'
for overriding the default behavior.

Thanks to Alexander V. Chernikov for the original patch.
This commit is contained in:
Ondrej Zajicek 2013-04-17 13:06:40 +02:00
parent cd3b02d198
commit 8df02847e8
5 changed files with 23 additions and 2 deletions
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13
doc/bird.sgml
View File

@ -1940,6 +1940,7 @@ protocol ospf <name> {
nonbroadcast|nbma|pointomultipoint|ptmp];
strict nonbroadcast <switch>;
real broadcast <switch>;
ptp netmask <switch>;
check link <switch>;
ecmp weight <num>;
authentication [none|simple|cryptographic];
@ -2183,6 +2184,18 @@ protocol ospf <name> {
probably is not interoperable with other OSPF
implementations. Default value is no.
<tag>ptp netmask <m/switch/</tag>
In <cf/type ptp/ network configurations, OSPFv2
implementations should ignore received netmask field in hello
packets and should send hello packets with zero netmask field
on unnumbered PtP links. But some OSPFv2 implementations
perform netmask checking even for PtP links. This option
specifies whether real netmask will be used in hello packets
on <cf/type ptp/ interfaces. You should ignore this option
unless you meet some compatibility problems related to this
issue. Default value is no for unnumbered PtP links, yes
otherwise.
<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

4
proto/ospf/config.Y
View File

@ -131,7 +131,7 @@ 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, REAL)
CF_KEYWORDS(GLOBAL, LSID, ROUTER, SELF, INSTANCE, REAL, NETMASK)
%type <t> opttext
%type <ld> lsadb_args
@ -290,6 +290,7 @@ ospf_iface_item:
| 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"); }
| PTP NETMASK bool { OSPF_PATT->ptp_netmask = $3; if (OSPF_VERSION != 2) cf_error("Real netmask 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 ; }
@ -364,6 +365,7 @@ ospf_iface_start:
OSPF_PATT->type = OSPF_IT_UNDEF;
init_list(&OSPF_PATT->nbma_list);
OSPF_PATT->autype = OSPF_AUTH_NONE;
OSPF_PATT->ptp_netmask = 2; /* not specified */
reset_passwords();
}
;

3
proto/ospf/hello.c
View File

@ -253,7 +253,8 @@ ospf_hello_send(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn)
#ifdef OSPFv2
pkt->netmask = ipa_mkmask(ifa->addr->pxlen);
ipa_hton(pkt->netmask);
if ((ifa->type == OSPF_IT_VLINK) || (ifa->type == OSPF_IT_PTP))
if ((ifa->type == OSPF_IT_VLINK) ||
((ifa->type == OSPF_IT_PTP) && !ifa->ptp_netmask))
pkt->netmask = IPA_NONE;
#endif

3
proto/ospf/iface.c
View File

@ -537,6 +537,9 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
#ifdef OSPFv2
ifa->autype = ip->autype;
ifa->passwords = ip->passwords;
ifa->ptp_netmask = !(addr->flags & IA_PEER);
if (ip->ptp_netmask < 2)
ifa->ptp_netmask = ip->ptp_netmask;
#endif
#ifdef OSPFv3

2
proto/ospf/ospf.h
View File

@ -273,6 +273,7 @@ struct ospf_iface
u16 rxbuf; /* Buffer size */
u8 check_link; /* Whether iface link change is used */
u8 ecmp_weight; /* Weight used for ECMP */
u8 ptp_netmask; /* Send real netmask for P2P */
};
struct ospf_md5
@ -810,6 +811,7 @@ struct ospf_iface_patt
u8 check_link;
u8 ecmp_weight;
u8 real_bcast; /* Not really used in OSPFv3 */
u8 ptp_netmask; /* bool but 2 for unspecified */
#ifdef OSPFv2
list *passwords;