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Filter: Allow setting the 'onlink' route attribute in filters

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Add static route attribute to set onlink flag for route next hop. Can be
used to build a dynamically routed IP-in-IP overlay network. Usage:

     ifname = "tunl0";
     onlink = true;
     gw = bgp_next_hop;
This commit is contained in:
Radu Carpa
2023-01-17 18:13:37 +01:00
committed by Ondrej Zajicek
parent 928a1cb034
commit 7144c9ca46
4 changed files with 23 additions and 3 deletions
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8
doc/bird.sgml
View File

@@ -1816,6 +1816,14 @@ Common route attributes are:
creation/removal. Zero is returned for routes with undefined outgoing
interfaces. Read-only.
<tag><label id="rta-onlink"><m/bool/ onlink</tag>
Onlink flag means that the specified nexthop is accessible on the
interface regardless of IP prefixes configured on the interface.
The attribute can be used to configure such next hops by first setting
<cf/onlink = true/ and <cf/ifname/, and then setting <cf/gw/. Possible
use case for setting this flag is to automatically build overlay IP-IP
networks on linux.
<tag><label id="rta-weight"><m/int/ weight</tag>
Multipath weight of route next hops. Valid values are 1-256. Reading
returns the weight of the first next hop, setting it sets weights of all

3
filter/config.Y
View File

@@ -305,7 +305,7 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
IF, THEN, ELSE, CASE,
FOR, IN, DO,
TRUE, FALSE, RT, RO, UNKNOWN, GENERIC,
FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, DEST, IFNAME, IFINDEX, WEIGHT, GW_MPLS,
FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, DEST, IFNAME, IFINDEX, WEIGHT, GW_MPLS, ONLINK,
PREFERENCE,
ROA_CHECK, ASN, SRC, DST,
IS_V4, IS_V6,
@@ -795,6 +795,7 @@ static_attr:
| WEIGHT { $$ = f_new_static_attr(T_INT, SA_WEIGHT, 0); }
| PREFERENCE { $$ = f_new_static_attr(T_INT, SA_PREF, 0); }
| GW_MPLS { $$ = f_new_static_attr(T_INT, SA_GW_MPLS, 0); }
| ONLINK { $$ = f_new_static_attr(T_BOOL, SA_ONLINK, 0); }
;
term:

1
filter/data.h
View File

@@ -102,6 +102,7 @@ enum f_sa_code {
SA_WEIGHT,
SA_PREF,
SA_GW_MPLS,
SA_ONLINK,
} PACKED;
/* Static attribute definition (members of struct rta) */

14
filter/f-inst.c
View File

@@ -694,6 +694,7 @@
case SA_WEIGHT: RESULT(sa.f_type, i, rta->nh.weight + 1); break;
case SA_PREF: RESULT(sa.f_type, i, rta->pref); break;
case SA_GW_MPLS: RESULT(sa.f_type, i, rta->nh.labels ? rta->nh.label[0] : MPLS_NULL); break;
case SA_ONLINK: RESULT(sa.f_type, i, rta->nh.flags & RNF_ONLINK ? 1 : 0); break;
default:
bug("Invalid static attribute access (%u/%u)", sa.f_type, sa.sa_code);
@@ -720,8 +721,8 @@
case SA_GW:
{
ip_addr ip = v1.val.ip;
struct iface *ifa = ipa_is_link_local(ip) ? rta->nh.iface : NULL;
neighbor *n = neigh_find((*fs->rte)->src->proto, ip, ifa, 0);
struct iface *ifa = ipa_is_link_local(ip) || (rta->nh.flags & RNF_ONLINK) ? rta->nh.iface : NULL;
neighbor *n = neigh_find((*fs->rte)->src->proto, ip, ifa, (rta->nh.flags & RNF_ONLINK) ? NEF_ONLINK : 0);
if (!n || (n->scope == SCOPE_HOST))
runtime( "Invalid gw address" );
@@ -801,6 +802,15 @@
rta->pref = v1.val.i;
break;
case SA_ONLINK:
{
if (v1.val.i)
rta->nh.flags |= RNF_ONLINK;
else
rta->nh.flags &= ~RNF_ONLINK;
}
break;
default:
bug("Invalid static attribute access (%u/%u)", sa.f_type, sa.sa_code);
}