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zebra: evpn update remote rmac and nexhop

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In symmetric routing case for evpn (type-2/type-5)
routes, nexthop and Router mac fields can change from
the originating VTEP.

At the receiving VTEP, bgp path info may points to different
nexthop IP (nh1->nh2) and Remote MAC remain the same.
When the bgp sync the route with nexthop and RMAC fields.
For the exisitng rmac entry update/replace with the new
nexthop (VTEP) IP in remote rmac db in Zebra.

Similarly, bgp path info may points different Router-mac
(RMAC1->RMAC2) and the nexthop value remains the same.
In this case, update to the new RMAC value for the
existing remote nexthop in the Zebra' nexthop cache db.

Ticket:CM-26917
Reviewed By:CCR-9435
Testing Done:

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>
This commit is contained in:
Chirag Shah 2019-10-28 13:47:05 -07:00
parent 306c4dab55
commit 651fa9053d
1 changed files with 40 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
zebra/zebra_vxlan.c
View File

@ -4615,18 +4615,21 @@ static int zl3vni_remote_rmac_add(zebra_l3vni_t *zl3vni, struct ethaddr *rmac,
{
char buf[ETHER_ADDR_STRLEN];
char buf1[INET6_ADDRSTRLEN];
char buf2[PREFIX_STRLEN];
zebra_mac_t *zrmac = NULL;
zrmac = zl3vni_rmac_lookup(zl3vni, rmac);
if (!zrmac) {
/* Create the RMAC entry, or update its vtep, if necessary. */
zrmac = zl3vni_rmac_add(zl3vni, rmac);
if (!zrmac) {
zlog_debug(
"Failed to add RMAC %s L3VNI %u Remote VTEP %s",
"Failed to add RMAC %s L3VNI %u Remote VTEP %s, prefix %s",
prefix_mac2str(rmac, buf, sizeof(buf)),
zl3vni->vni,
ipaddr2str(vtep_ip, buf1, sizeof(buf1)));
ipaddr2str(vtep_ip, buf1, sizeof(buf1)),
prefix2str(host_prefix, buf2, sizeof(buf2)));
return -1;
}
memset(&zrmac->fwd_info, 0, sizeof(zrmac->fwd_info));
@ -4636,6 +4639,21 @@ static int zl3vni_remote_rmac_add(zebra_l3vni_t *zl3vni, struct ethaddr *rmac,
hook_call(zebra_rmac_update, zrmac, zl3vni, false,
"new RMAC added");
/* install rmac in kernel */
zl3vni_rmac_install(zl3vni, zrmac);
} else if (!IPV4_ADDR_SAME(&zrmac->fwd_info.r_vtep_ip,
&vtep_ip->ipaddr_v4)) {
if (IS_ZEBRA_DEBUG_VXLAN)
zlog_debug(
"L3VNI %u Remote VTEP change(%s -> %s) for RMAC %s, prefix %s",
zl3vni->vni,
inet_ntoa(zrmac->fwd_info.r_vtep_ip),
ipaddr2str(vtep_ip, buf1, sizeof(buf1)),
prefix_mac2str(rmac, buf, sizeof(buf)),
prefix2str(host_prefix, buf2, sizeof(buf2)));
zrmac->fwd_info.r_vtep_ip = vtep_ip->ipaddr_v4;
/* install rmac in kernel */
zl3vni_rmac_install(zl3vni, zrmac);
}
@ -4786,24 +4804,39 @@ static int zl3vni_remote_nh_add(zebra_l3vni_t *zl3vni, struct ipaddr *vtep_ip,
struct prefix *host_prefix)
{
char buf[ETHER_ADDR_STRLEN];
char buf1[INET6_ADDRSTRLEN];
char buf1[ETHER_ADDR_STRLEN];
char buf2[INET6_ADDRSTRLEN];
char buf3[PREFIX_STRLEN];
zebra_neigh_t *nh = NULL;
/* Create the next hop entry, or update its mac, if necessary. */
nh = zl3vni_nh_lookup(zl3vni, vtep_ip);
if (!nh) {
nh = zl3vni_nh_add(zl3vni, vtep_ip, rmac);
if (!nh) {
zlog_debug(
"Failed to add NH as Neigh (IP %s MAC %s L3-VNI %u)",
ipaddr2str(vtep_ip, buf1, sizeof(buf1)),
"Failed to add NH %s as Neigh (RMAC %s L3-VNI %u prefix %s)",
ipaddr2str(vtep_ip, buf1, sizeof(buf2)),
prefix_mac2str(rmac, buf, sizeof(buf)),
zl3vni->vni);
zl3vni->vni,
prefix2str(host_prefix, buf2, sizeof(buf2)));
return -1;
}
/* install the nh neigh in kernel */
zl3vni_nh_install(zl3vni, nh);
} else if (memcmp(&nh->emac, rmac, ETH_ALEN) != 0) {
if (IS_ZEBRA_DEBUG_VXLAN)
zlog_debug("L3VNI %u RMAC change(%s --> %s) for nexthop %s, prefix %s",
zl3vni->vni,
prefix_mac2str(&nh->emac, buf, sizeof(buf)),
prefix_mac2str(rmac, buf1, sizeof(buf1)),
ipaddr2str(vtep_ip, buf2, sizeof(buf2)),
prefix2str(host_prefix, buf3, sizeof(buf3)));
memcpy(&nh->emac, rmac, ETH_ALEN);
/* install (update) the nh neigh in kernel */
zl3vni_nh_install(zl3vni, nh);
}
rb_find_or_add_host(&nh->host_rb, host_prefix);