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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
Download Patch File Download Diff File Expand all files Collapse all files

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);
}