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Louis Scalbert 7a2d046990 bgpd: fix 6vpe nexthop
6vPE enables the announcement of IPv6 VPN prefixes through an IPv4 BGP
session. In this scenario, the next hop addresses for these prefixes are
represented in an IPv4-mapped IPv6 format, noted as ::ffff:[IPv4]. This
format indicates to the peer that it should route these IPv6 addresses
using information from the IPv4 nexthop. For example:

> Path Attribute - MP_REACH_NLRI
> [...]
>     Address family identifier (AFI): IPv6 (2)
>     Subsequent address family identifier (SAFI): Labeled VPN Unicast (128)
>     Next hop:  RD=0:0 IPv6=::ffff:192.0.2.5 RD=0:0 Link-local=fe80::501d:42ff:feef:b021
>     Number of Subnetwork points of attachment (SNPA): 0

This rule is set out in RFC4798:

> The IPv4 address of the egress 6PE router MUST be encoded as an
> IPv4-mapped IPv6 address in the BGP Next Hop field.

However, in some situations, bgpd sends a standard nexthop IPv6 address
instead of an IPv4-mapped IPv6 address because the outgoing interface for
the BGP session has a valid IPv6 address. This is problematic because
the peer router may not be able to route the nexthop IPv6 address (ie.
if the outgoing interface has not IPv6).

Fix the issue by always sending a IPv4-mapped IPv6 address as nexthop
when the BGP session is on IPv4 and address family IPv6.

Link: https://datatracker.ietf.org/doc/html/rfc4798#section-2
Fixes: 92d6f76 ("lib,zebra,bgpd: Fix for nexthop as IPv4 mapped IPv6 address")
Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
(cherry picked from commit 0325116a27)
2024-02-28 09:35:43 +00:00
.github github: Add rebase label on PR if it's > 50 commits behind 2023-05-09 09:37:23 +03:00
alpine docker: Use openssl instead of libressl 2023-07-31 11:04:30 +03:00
babeld Merge pull request #13333 from donaldsharp/vrf_bitmap_cleanup 2023-07-04 22:11:11 +03:00
bfdd *: remove ZEBRA_INTERFACE_VRF_UPDATE 2023-10-07 10:06:39 +08:00
bgpd bgpd: fix 6vpe nexthop 2024-02-28 09:35:43 +00:00
debian debian: Drop 9.2-dev release from stable branch changelog 2023-11-15 22:17:04 +02:00
doc doc: add param range for graceful-restart helper supported-grace-time 2023-12-14 05:42:06 +00:00
docker docker: Install the apk packages regardless of the platform 2023-07-31 11:05:15 +03:00
eigrpd eigrp: use correct memory pool on interface deletion 2023-10-11 14:19:23 +00:00
fpm *: auto-convert to SPDX License IDs 2023-02-09 14:09:11 +01:00
gdb *: Rename thread.[ch] to event.[ch] 2023-03-24 08:32:16 -04:00
grpc *: manual SPDX License ID conversions 2023-02-09 14:09:07 +01:00
include bgpd,lib,sharpd,zebra: srv6 introduce multiple segs/SIDs in nexthop 2023-09-20 15:07:15 +02:00
isisd isisd: fix _isis_spftree_del heap-use-after-free 2024-01-05 08:47:58 +00:00
ldpd ldpd: Stop and free synchronous Zebra client on destroy 2023-06-27 11:47:50 +03:00
lib lib: Do not convert EVPN prefixes into IPv4/IPv6 if not needed 2024-02-23 09:34:05 +02:00
m4 build: fix sed regex in Lua macro 2022-12-08 12:39:17 +01:00
mgmtd mgmtd: fix local validation 2023-11-08 13:50:36 +00:00
mlag build: fix AM_LDFLAGS usage (and gcov) 2021-07-21 17:10:08 +02:00
nhrpd nhrp: fix race condition 2024-02-09 15:58:16 +00:00
ospf6d ospf6d: Let the user override interface cost for a loopback 2023-11-14 13:57:10 +00:00
ospfclient *: Convert event.h to frrevent.h 2023-03-24 08:32:17 -04:00
ospfd ospfd: Solved crash in OSPF TE parsing 2024-02-27 15:42:49 +00:00
pathd pathd: add no pcep command 2023-10-31 16:05:32 +00:00
pbrd pbrd: Fix PBR handling for last rule deletion 2024-01-25 08:01:07 +00:00
pceplib *: auto-convert to SPDX License IDs 2023-02-09 14:09:11 +01:00
pimd pimd: re-evaluated S,G OILs upon RP changes and for empty SG upstream oils 2024-02-09 15:17:03 +00:00
pkgsrc mgmtd: Bringup MGMTD daemon and datastore module support 2023-03-21 22:08:32 -04:00
python [ospfd]: add support for RFC 5709 HMAC-SHA Auth 2023-09-16 07:38:23 +03:30
qpb mgmtd: Bringup MGMTD daemon and datastore module support 2023-03-21 22:08:32 -04:00
redhat redhat, debian: Update release notes for 9.1 release 2023-11-12 20:08:56 +02:00
ripd *: remove ZEBRA_INTERFACE_VRF_UPDATE 2023-10-07 10:06:39 +08:00
ripngd *: remove ZEBRA_INTERFACE_VRF_UPDATE 2023-10-07 10:06:39 +08:00
sharpd *: Do not cast to the same type as the destination is 2023-09-29 10:24:16 +03:00
snapcraft snapcraft: Use libyang 2.1.80 2023-07-20 21:46:38 +03:00
staticd staticd: fix changing to source auto in bfd monitor 2023-12-06 13:06:16 +00:00
tests topotests: add an ebgp 6vpe test 2024-02-28 09:35:43 +00:00
tools tools: fix frr-reload multiple no description cmds 2024-02-08 22:04:57 +01:00
vrrpd Merge pull request #13731 from cyberstorm-mauritius/cid1519841 2023-06-21 23:15:41 +05:30
vtysh lib,vtysh: fix show route map JSON output 2023-11-28 13:47:41 +00:00
watchfrr watchfrr: Extend ignore option to daemon being killed 2023-10-19 15:49:16 +00:00
yang Revert "yang: add bgp link-state" 2023-10-11 05:02:53 +00:00
zebra zebra: fix crash if macvlan link in another netns 2024-02-27 16:32:40 +00:00
.clang-format lib: add dynamic array type 2023-06-27 18:00:56 -04:00
.dockerignore docker: Make docker image on CentOS 7 2019-11-26 19:29:30 +00:00
.flake8 style: add format checker config that matches FRR style standards 2023-04-18 05:18:26 -04:00
.git-blame-ignore-revs tools: Ignore mass renaming of topotests for git blame 2021-05-11 14:14:26 +03:00
.gitignore doc: configure: add configure option to generate .ccls file 2023-05-18 09:32:32 -04:00
.isort.cfg style: add format checker config that matches FRR style standards 2023-04-18 05:18:26 -04:00
.pylintrc style: add format checker config that matches FRR style standards 2023-04-18 05:18:26 -04:00
.travis.yml lib: libyang2 add missed conversion 2021-05-17 22:13:59 -04:00
bootstrap.sh build: turn on automake warnings (& symlinks) 2021-04-21 15:42:37 +02:00
buildtest.sh *: manual SPDX License ID conversions 2023-02-09 14:09:07 +01:00
config.version.in build: carry --with-pkg-extra-version into tarballs 2018-10-24 15:11:50 +02:00
configure.ac FRR Release 9.1 2023-11-15 17:01:50 +02:00
COPYING *: sort out & explain licenses used in FRR 2023-02-09 12:46:13 +01:00
Makefile.am build: clean up mgmtd lib protobuf make syntax 2023-03-27 16:44:27 -04:00
README.md doc: Fix the link that points to Slack invitation in README 2022-03-24 13:13:37 +02:00
stamp-h.in Initial revision 2002-12-13 20:15:29 +00:00
version.h build: make builddir include path consistent 2021-04-21 15:42:33 +02:00

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FRRouting

FRR is free software that implements and manages various IPv4 and IPv6 routing protocols. It runs on nearly all distributions of Linux and BSD and supports all modern CPU architectures.

FRR currently supports the following protocols:

  • BGP
  • OSPFv2
  • OSPFv3
  • RIPv1
  • RIPv2
  • RIPng
  • IS-IS
  • PIM-SM/MSDP
  • LDP
  • BFD
  • Babel
  • PBR
  • OpenFabric
  • VRRP
  • EIGRP (alpha)
  • NHRP (alpha)

Installation & Use

For source tarballs, see the releases page.

For Debian and its derivatives, use the APT repository at https://deb.frrouting.org/.

Instructions on building and installing from source for supported platforms may be found in the developer docs.

Once installed, please refer to the user guide for instructions on use.

Community

The FRRouting email list server is located here and offers the following public lists:

Topic List
Development dev@lists.frrouting.org
Users & Operators frog@lists.frrouting.org
Announcements announce@lists.frrouting.org

For chat, we currently use Slack. You can join by clicking the "Slack" link under the Participate section of our website.

Contributing

FRR maintains developer's documentation which contains the project workflow and expectations for contributors. Some technical documentation on project internals is also available.

We welcome and appreciate all contributions, no matter how small!

Security

To report security issues, please use our security mailing list:

security [at] lists.frrouting.org