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bgpd: add vty command to select label allocation per nexthop

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A new VTY command is introduced in ipv4 unicast and ipv6 unicast
address family, under a BGP instance.

 > r1# label vpn export allocation-mode per-nexthop|per-vrf

This command will update the label values associated for each
BGP update to export to the global instance. Two modes are
available: per-nexthop and per-vrf. The latter is the default
one.

With this commit only, configuring label allocation per nexthop
will only reset the BGP updates, and the per-vrf mode label
allocation will be chosen.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2023-02-15 21:03:19 +01:00
parent f081a1924c
commit bbae0bb042
2 changed files with 68 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
bgpd/bgp_vty.c
View File

@ -9140,6 +9140,63 @@ ALIAS (af_rd_vpn_export,
"Between current address-family and vpn\n"
"For routes leaked from current address-family to vpn\n")
DEFPY(af_label_vpn_export_allocation_mode,
af_label_vpn_export_allocation_mode_cmd,
"[no$no] label vpn export allocation-mode <per-vrf$label_per_vrf|per-nexthop$label_per_nh>",
NO_STR
"label value for VRF\n"
"Between current address-family and vpn\n"
"For routes leaked from current address-family to vpn\n"
"Label allocation mode\n"
"Allocate one label for all BGP updates of the VRF\n"
"Allocate a label per connected next-hop in the VRF\n")
{
VTY_DECLVAR_CONTEXT(bgp, bgp);
afi_t afi;
bool old_per_nexthop, new_per_nexthop;
afi = vpn_policy_getafi(vty, bgp, false);
old_per_nexthop = !!CHECK_FLAG(bgp->vpn_policy[afi].flags,
BGP_VPN_POLICY_TOVPN_LABEL_PER_NEXTHOP);
if (no) {
if (old_per_nexthop == false && label_per_nh)
return CMD_ERR_NO_MATCH;
if (old_per_nexthop == true && label_per_vrf)
return CMD_ERR_NO_MATCH;
new_per_nexthop = false;
} else {
if (label_per_nh)
new_per_nexthop = true;
else
new_per_nexthop = false;
}
/* no change */
if (old_per_nexthop == new_per_nexthop)
return CMD_SUCCESS;
/*
* pre-change: un-export vpn routes (vpn->vrf routes unaffected)
*/
vpn_leak_prechange(BGP_VPN_POLICY_DIR_TOVPN, afi, bgp_get_default(),
bgp);
if (new_per_nexthop)
SET_FLAG(bgp->vpn_policy[afi].flags,
BGP_VPN_POLICY_TOVPN_LABEL_PER_NEXTHOP);
else
UNSET_FLAG(bgp->vpn_policy[afi].flags,
BGP_VPN_POLICY_TOVPN_LABEL_PER_NEXTHOP);
/* post-change: re-export vpn routes */
vpn_leak_postchange(BGP_VPN_POLICY_DIR_TOVPN, afi, bgp_get_default(),
bgp);
hook_call(bgp_snmp_update_last_changed, bgp);
return CMD_SUCCESS;
}
DEFPY (af_label_vpn_export,
af_label_vpn_export_cmd,
"[no] label vpn export <(0-1048575)$label_val|auto$label_auto>",
@ -17245,6 +17302,12 @@ static void bgp_vpn_policy_config_write_afi(struct vty *vty, struct bgp *bgp,
}
}
if (CHECK_FLAG(bgp->vpn_policy[afi].flags,
BGP_VPN_POLICY_TOVPN_LABEL_PER_NEXTHOP))
vty_out(vty,
"%*slabel vpn export allocation-mode per-nexthop\n",
indent, "");
tovpn_sid_index = bgp->vpn_policy[afi].tovpn_sid_index;
if (CHECK_FLAG(bgp->vpn_policy[afi].flags,
BGP_VPN_POLICY_TOVPN_SID_AUTO)) {
@ -20403,6 +20466,10 @@ void bgp_vty_init(void)
install_element(BGP_IPV6_NODE, &af_rd_vpn_export_cmd);
install_element(BGP_IPV4_NODE, &af_label_vpn_export_cmd);
install_element(BGP_IPV6_NODE, &af_label_vpn_export_cmd);
install_element(BGP_IPV4_NODE,
&af_label_vpn_export_allocation_mode_cmd);
install_element(BGP_IPV6_NODE,
&af_label_vpn_export_allocation_mode_cmd);
install_element(BGP_IPV4_NODE, &af_nexthop_vpn_export_cmd);
install_element(BGP_IPV6_NODE, &af_nexthop_vpn_export_cmd);
install_element(BGP_IPV4_NODE, &af_rt_vpn_imexport_cmd);

1
bgpd/bgpd.h
View File

@ -211,6 +211,7 @@ struct vpn_policy {
#define BGP_VPN_POLICY_TOVPN_RD_SET (1 << 1)
#define BGP_VPN_POLICY_TOVPN_NEXTHOP_SET (1 << 2)
#define BGP_VPN_POLICY_TOVPN_SID_AUTO (1 << 3)
#define BGP_VPN_POLICY_TOVPN_LABEL_PER_NEXTHOP (1 << 4)
/*
* If we are importing another vrf into us keep a list of