[bgp, lib, tests, zebra] Add support for IPv6 VTEP for VXLAN Single Homing #18539
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ton31337
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Mar 29, 2025
Ok, I'll finish porting of the BGP and topotest changes, and add documentation before asking for review. |
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- %pI4 to %pIA - "struct in_addr" to "struct ipaddr" - Stop changes at the ZAPI boundary until BGP is IPv6 VTEP aware - Show command filter changes as necessary to support IPv6 VTEP arguments - Add "ipaddr_is_mcast" to lib/ipaddr.h This is intended to be a no-harm commit until more IPv6 VTEP code is committed. Signed-off-by: Mike Mallin <mmallin@cisco.com> Co-authored-by: Tarek Saad <tsaad@cisco.com> Co-authored-by: Ramanan Natarajan <ramannat@cisco.com>
This commit enables Kernel forwarding for IPv4 hosts which are reachable over an IPv6 overlay. The RTA_VIA attribute is used for correct forwarding in the kernel. A minor bugfix, when Zebra receives a route add, the nexthop type is used instead of the route address family in order to decode the EVPN Nexthop Address correctly. Otherwise it tries to truncate the IPv6 VTEP address and use it as a IPv4 VTEP... Signed-off-by: Mike Mallin <mmallin@cisco.com> Co-authored-by: Barry Friedman <friedman@cisco.com>
- %pI4 -> %pIA - struct in_addr -> struct ip_addr - Added zebra IPv6 VTEP handling code behind #if 0 (will enable in next commit with the topotests for Single Homed IPv6 VTEP) - Use either "mp_nexthop_global_in" (IPv4 VTEP) or "mp_nexthop_global" (IPv6 VTEP) for sending/receiving the nexthop of the route - Show commands with a VTEP filter will be extended for IPv6 support in an upcoming commit Signed-off-by: Mike Mallin <mmallin@cisco.com> Co-authored-by: Tarek Saad <tsaad@cisco.com>
This commit switches the ZAPI messaging to send/receive "struct ipaddr" between BGP and Zebra for L2VNI, L3VNI and MAC-IP. A variant of bgp_evpn_rt5 for V6 VTEP is added to test the changes from end-to-end. Signed-off-by: Mike Mallin <mmallin@cisco.com>
Signed-off-by: Mike Mallin <mmallin@cisco.com>
Signed-off-by: Mike Mallin <mmallin@cisco.com>
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TODO
Open Questions for Reviewers (
V6_VTEP_PR_QUESTION)Description
This PR extends FRR to support IPv6 VTEPs for VxLAN. It also enables IPv4 over IPv6 VTEP forwarding in the Linux Kernel using the
RTA_VIAattribute.Lib changes
ipaddr_is_mcastZebra Changes
%pI4to%pIAstruct in_addrtostruct ipaddrarguments
BGP Changes
%pI4->%pIAstruct in_addr->struct ip_addrmp_nexthop_global_in(IPv4 VTEP) ormp_nexthop_global(IPv6 VTEP) for sending/receiving the nexthop of the route
Topotest Changes
Added V6 VTEP variants of the following topotests:
Documentation Changes
TODO
This is part of the upstreaming process for #5885.