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bgpd: support for default-originate type-5 route

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Implement support for 'default-originate' for L2VPN/EVPN address family.
This is needed for the case where external routing within a POD,
will follow the default route to the border/exit leaf.
The border leaf has more than one next hop to forward the packet on to,
depending on the destination IP.

Signed-off-by: Mitesh Kanjariya <mitesh@cumulusnetworks.com>
This commit is contained in:
Mitesh Kanjariya 2018-02-15 17:20:27 -08:00 committed by mitesh
parent 154faa5007
commit 486456ca92
4 changed files with 285 additions and 0 deletions
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180
0001-bgpd-support-for-default-originate-type-5-route.patch Normal file
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@ -0,0 +1,180 @@
From dbc3fbc612ce6523a596804c270600de1f6f2309 Mon Sep 17 00:00:00 2001
From: Mitesh Kanjariya <mitesh@marvel-07.cumulusnetworks.com>
Date: Thu, 15 Feb 2018 17:20:27 -0800
Subject: [PATCH] bgpd: support for default-originate type-5 route
Implement support for 'default-originate' for L2VPN/EVPN address family.
This is needed for the case where external routing within a POD,
will follow the default route to the border/exit leaf.
The border/exit leaf has more than one next hop to forward the packet on to,
depending on the destination IP.
Signed-off-by: Mitesh Kanjariya <mitesh@cumulusnetworks.com>
---
bgpd/bgp_evpn_private.h | 14 ++++++++
bgpd/bgp_evpn_vty.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++
bgpd/bgpd.h | 2 ++
3 files changed, 105 insertions(+)
diff --git a/bgpd/bgp_evpn_private.h b/bgpd/bgp_evpn_private.h
index 5ff16c3..bc68e25 100644
--- a/bgpd/bgp_evpn_private.h
+++ b/bgpd/bgp_evpn_private.h
@@ -349,6 +349,20 @@ static inline void build_evpn_type3_prefix(struct prefix_evpn *p,
p->prefix.ip.ipaddr_v4 = originator_ip;
}
+static inline int evpn_default_originate_set(struct bgp *bgp, afi_t afi,
+ safi_t safi)
+{
+ if (afi == AFI_IP &&
+ CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
+ BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4))
+ return 1;
+ else if (afi == AFI_IP6 &&
+ CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
+ BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6))
+ return 1;
+ return 0;
+}
+
extern void evpn_rt_delete_auto(struct bgp*, vni_t, struct list*);
extern void bgp_evpn_configure_export_rt_for_vrf(struct bgp *bgp_vrf,
struct ecommunity *ecomadd);
diff --git a/bgpd/bgp_evpn_vty.c b/bgpd/bgp_evpn_vty.c
index 1720744..5ce71db 100644
--- a/bgpd/bgp_evpn_vty.c
+++ b/bgpd/bgp_evpn_vty.c
@@ -2476,6 +2476,48 @@ static void evpn_unset_advertise_default_gw(struct bgp *bgp,
/*
* evpn - enable advertisement of default g/w
*/
+static void evpn_process_default_originate_cmd(struct bgp *bgp_vrf,
+ afi_t afi, int add)
+{
+ struct prefix ip_prefix;
+ safi_t safi = SAFI_UNICAST; /* ipv4/ipv6 unicast */
+
+ /* form the default prefix 0.0.0.0/0 */
+ memset(&ip_prefix, 0, sizeof(struct prefix));
+ ip_prefix.family = afi2family(afi);
+ ip_prefix.prefixlen = 0;
+
+ if (add) {
+ /* bail if we are already advertising default route */
+ if (evpn_default_originate_set(bgp_vrf, afi, safi))
+ return;
+
+ if (afi == AFI_IP)
+ SET_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
+ BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4);
+ else if (afi == AFI_IP6)
+ SET_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
+ BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6);
+ bgp_evpn_advertise_type5_route(bgp_vrf, &ip_prefix,
+ NULL, afi, safi);
+ } else {
+ /* bail out if we havent advertised the default route */
+ if (!evpn_default_originate_set(bgp_vrf, afi, safi))
+ return;
+ if (afi == AFI_IP)
+ UNSET_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
+ BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4);
+ else if (afi == AFI_IP6)
+ UNSET_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
+ BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6);
+ bgp_evpn_withdraw_type5_route(bgp_vrf, &ip_prefix,
+ afi, safi);
+ }
+}
+
+/*
+ * evpn - enable advertisement of default g/w
+ */
static void evpn_set_advertise_subnet(struct bgp *bgp,
struct bgpevpn *vpn)
{
@@ -2671,6 +2713,43 @@ DEFUN (no_bgp_evpn_advertise_all_vni,
return CMD_SUCCESS;
}
+DEFUN (bgp_evpn_default_originate,
+ bgp_evpn_default_originate_cmd,
+ "default-originate <ipv4 | ipv6>",
+ "originate a default route\n"
+ "ipv4 address family\n"
+ "ipv6 address family\n")
+{
+ afi_t afi = 0;
+ int idx_afi = 0;
+ struct bgp *bgp_vrf = VTY_GET_CONTEXT(bgp);
+
+ if (!bgp_vrf)
+ return CMD_WARNING;
+ argv_find_and_parse_afi(argv, argc, &idx_afi, &afi);
+ evpn_process_default_originate_cmd(bgp_vrf, afi, 1);
+ return CMD_SUCCESS;
+}
+
+DEFUN (no_bgp_evpn_default_originate,
+ no_bgp_evpn_default_originate_cmd,
+ "no default-originate <ipv4 | ipv6>",
+ NO_STR
+ "withdraw a default route\n"
+ "ipv4 address family\n"
+ "ipv6 address family\n")
+{
+ afi_t afi = 0;
+ int idx_afi = 0;
+ struct bgp *bgp_vrf = VTY_GET_CONTEXT(bgp);
+
+ if (!bgp_vrf)
+ return CMD_WARNING;
+ argv_find_and_parse_afi(argv, argc, &idx_afi, &afi);
+ evpn_process_default_originate_cmd(bgp_vrf, afi, 0);
+ return CMD_SUCCESS;
+}
+
DEFUN (bgp_evpn_advertise_vni_subnet,
bgp_evpn_advertise_vni_subnet_cmd,
"advertise-subnet",
@@ -4382,6 +4461,14 @@ void bgp_config_write_evpn_info(struct vty *vty, struct bgp *bgp, afi_t afi,
if (CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_ADVERTISE_IPV6_UNICAST))
vty_out(vty, " advertise ipv6 unicast\n");
+
+ if (CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
+ BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4))
+ vty_out(vty, " default-originate ipv4\n");
+
+ if (CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
+ BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6))
+ vty_out(vty, " default-originate ipv6\n");
}
void bgp_ethernetvpn_init(void)
@@ -4411,6 +4498,8 @@ void bgp_ethernetvpn_init(void)
install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_default_gw_cmd);
install_element(BGP_EVPN_NODE, &bgp_evpn_advertise_type5_cmd);
install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_type5_cmd);
+ install_element(BGP_EVPN_NODE, &bgp_evpn_default_originate_cmd);
+ install_element(BGP_EVPN_NODE, &no_bgp_evpn_default_originate_cmd);
/* "show bgp l2vpn evpn" commands. */
install_element(VIEW_NODE, &show_bgp_l2vpn_evpn_vni_cmd);
diff --git a/bgpd/bgpd.h b/bgpd/bgpd.h
index 5b77be2..274ca82 100644
--- a/bgpd/bgpd.h
+++ b/bgpd/bgpd.h
@@ -323,6 +323,8 @@ struct bgp {
/* l2vpn evpn flags */
#define BGP_L2VPN_EVPN_ADVERTISE_IPV4_UNICAST (1 << 0)
#define BGP_L2VPN_EVPN_ADVERTISE_IPV6_UNICAST (1 << 1)
+#define BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4 (1 << 2)
+#define BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6 (1 << 3)
/* Route table for next-hop lookup cache. */
--
2.7.4

14
bgpd/bgp_evpn_private.h
View File

@ -349,6 +349,20 @@ static inline void build_evpn_type3_prefix(struct prefix_evpn *p,
p->prefix.ip.ipaddr_v4 = originator_ip; p->prefix.ip.ipaddr_v4 = originator_ip;
} }
static inline int evpn_default_originate_set(struct bgp *bgp, afi_t afi,
safi_t safi)
{
if (afi == AFI_IP &&
CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4))
return 1;
else if (afi == AFI_IP6 &&
CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6))
return 1;
return 0;
}
extern void evpn_rt_delete_auto(struct bgp*, vni_t, struct list*); extern void evpn_rt_delete_auto(struct bgp*, vni_t, struct list*);
extern void bgp_evpn_configure_export_rt_for_vrf(struct bgp *bgp_vrf, extern void bgp_evpn_configure_export_rt_for_vrf(struct bgp *bgp_vrf,
struct ecommunity *ecomadd); struct ecommunity *ecomadd);

89
bgpd/bgp_evpn_vty.c
View File

@ -2473,6 +2473,48 @@ static void evpn_unset_advertise_default_gw(struct bgp *bgp,
return; return;
} }
/*
* evpn - enable advertisement of default g/w
*/
static void evpn_process_default_originate_cmd(struct bgp *bgp_vrf,
afi_t afi, int add)
{
struct prefix ip_prefix;
safi_t safi = SAFI_UNICAST; /* ipv4/ipv6 unicast */
/* form the default prefix 0.0.0.0/0 */
memset(&ip_prefix, 0, sizeof(struct prefix));
ip_prefix.family = afi2family(afi);
ip_prefix.prefixlen = 0;
if (add) {
/* bail if we are already advertising default route */
if (evpn_default_originate_set(bgp_vrf, afi, safi))
return;
if (afi == AFI_IP)
SET_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4);
else if (afi == AFI_IP6)
SET_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6);
bgp_evpn_advertise_type5_route(bgp_vrf, &ip_prefix,
NULL, afi, safi);
} else {
/* bail out if we havent advertised the default route */
if (!evpn_default_originate_set(bgp_vrf, afi, safi))
return;
if (afi == AFI_IP)
UNSET_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4);
else if (afi == AFI_IP6)
UNSET_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6);
bgp_evpn_withdraw_type5_route(bgp_vrf, &ip_prefix,
afi, safi);
}
}
/* /*
* evpn - enable advertisement of default g/w * evpn - enable advertisement of default g/w
*/ */
@ -2671,6 +2713,43 @@ DEFUN (no_bgp_evpn_advertise_all_vni,
return CMD_SUCCESS; return CMD_SUCCESS;
} }
DEFUN (bgp_evpn_default_originate,
bgp_evpn_default_originate_cmd,
"default-originate <ipv4 | ipv6>",
"originate a default route\n"
"ipv4 address family\n"
"ipv6 address family\n")
{
afi_t afi = 0;
int idx_afi = 0;
struct bgp *bgp_vrf = VTY_GET_CONTEXT(bgp);
if (!bgp_vrf)
return CMD_WARNING;
argv_find_and_parse_afi(argv, argc, &idx_afi, &afi);
evpn_process_default_originate_cmd(bgp_vrf, afi, 1);
return CMD_SUCCESS;
}
DEFUN (no_bgp_evpn_default_originate,
no_bgp_evpn_default_originate_cmd,
"no default-originate <ipv4 | ipv6>",
NO_STR
"withdraw a default route\n"
"ipv4 address family\n"
"ipv6 address family\n")
{
afi_t afi = 0;
int idx_afi = 0;
struct bgp *bgp_vrf = VTY_GET_CONTEXT(bgp);
if (!bgp_vrf)
return CMD_WARNING;
argv_find_and_parse_afi(argv, argc, &idx_afi, &afi);
evpn_process_default_originate_cmd(bgp_vrf, afi, 0);
return CMD_SUCCESS;
}
DEFUN (bgp_evpn_advertise_vni_subnet, DEFUN (bgp_evpn_advertise_vni_subnet,
bgp_evpn_advertise_vni_subnet_cmd, bgp_evpn_advertise_vni_subnet_cmd,
"advertise-subnet", "advertise-subnet",
@ -4382,6 +4461,14 @@ void bgp_config_write_evpn_info(struct vty *vty, struct bgp *bgp, afi_t afi,
if (CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN], if (CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_ADVERTISE_IPV6_UNICAST)) BGP_L2VPN_EVPN_ADVERTISE_IPV6_UNICAST))
vty_out(vty, " advertise ipv6 unicast\n"); vty_out(vty, " advertise ipv6 unicast\n");
if (CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4))
vty_out(vty, " default-originate ipv4\n");
if (CHECK_FLAG(bgp->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6))
vty_out(vty, " default-originate ipv6\n");
} }
void bgp_ethernetvpn_init(void) void bgp_ethernetvpn_init(void)
@ -4411,6 +4498,8 @@ void bgp_ethernetvpn_init(void)
install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_default_gw_cmd); install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_default_gw_cmd);
install_element(BGP_EVPN_NODE, &bgp_evpn_advertise_type5_cmd); install_element(BGP_EVPN_NODE, &bgp_evpn_advertise_type5_cmd);
install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_type5_cmd); install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_type5_cmd);
install_element(BGP_EVPN_NODE, &bgp_evpn_default_originate_cmd);
install_element(BGP_EVPN_NODE, &no_bgp_evpn_default_originate_cmd);
/* "show bgp l2vpn evpn" commands. */ /* "show bgp l2vpn evpn" commands. */
install_element(VIEW_NODE, &show_bgp_l2vpn_evpn_vni_cmd); install_element(VIEW_NODE, &show_bgp_l2vpn_evpn_vni_cmd);

2
bgpd/bgpd.h
View File

@ -323,6 +323,8 @@ struct bgp {
/* l2vpn evpn flags */ /* l2vpn evpn flags */
#define BGP_L2VPN_EVPN_ADVERTISE_IPV4_UNICAST (1 << 0) #define BGP_L2VPN_EVPN_ADVERTISE_IPV4_UNICAST (1 << 0)
#define BGP_L2VPN_EVPN_ADVERTISE_IPV6_UNICAST (1 << 1) #define BGP_L2VPN_EVPN_ADVERTISE_IPV6_UNICAST (1 << 1)
#define BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV4 (1 << 2)
#define BGP_L2VPN_EVPN_DEFAULT_ORIGINATE_IPV6 (1 << 3)
/* Route table for next-hop lookup cache. */ /* Route table for next-hop lookup cache. */