[PATCH iproute2-next v1 RESEND 0/6] seg6: SRv6 Mobile User Plane (RFC 9433)

[Yuya Kusakabe <yuya.kusakabe@gmail.com>]

Resending v1 unchanged; the previous send had Message-IDs under
the wrong domain.  Please ignore:
  https://lore.kernel.org/netdev/20260503153006.900533-1-y-kusakabe@bbsakura.net/

This series adds the iproute2 frontend for the SRv6 Mobile User Plane
(MUP) endpoint behaviors of RFC 9433.  It is sent in parallel with the
matching kernel net-next series; each commit here is self-contained
and brings in the seg6local UAPI bits it needs from the in-progress
kernel UAPI header (include/uapi/linux/seg6_local.h):

  Section 6.2  End.MAP
  Section 6.3  End.M.GTP6.D
  Section 6.4  End.M.GTP6.D.Di
  Section 6.5  End.M.GTP6.E
  Section 6.6  End.M.GTP4.E
  Section 6.7  H.M.GTP4.D

The series adds these seg6local CLI keywords:

  src                  IPv6 source-address template
  v4_mask_len          length of the IPv4 DA portion of the SID, in
                       bits (1..32)
  sr_prefix_len        locator length of the egress End.M.GTP*.E SID,
                       in bits (1..88, leaving 40 bits for the
                       Args.Mob.Session field)
  v6_src_prefix_len    Source UPF Prefix length P in the IPv6 SA
                       template (1..127, defaults to 64); requires
                       P + v4_mask_len <= 128
  pdu_type             GTP-U PDU Session Container PDU Type (3GPP
                       TS 38.415 Section 5.5.2): downlink|dl|uplink|ul
                       or 0..15.  When omitted, the egress emits a
                       short GTPv1-U header (no PDU Session Container)
                       regardless of the QFI in the SID; 5G N3
                       deployments must set pdu_type explicitly.

A small per-action attribute validator (introduced in patch 1 and
extended by each subsequent behavior) rejects obvious typos in the
seg6local block at the userspace layer instead of leaving the
operator with an opaque kernel EINVAL.

Link: https://datatracker.ietf.org/doc/html/rfc9433

Yuya Kusakabe (6):
  seg6: add support for the End.MAP behavior
  seg6: add support for the End.M.GTP4.E behavior
  seg6: add support for the End.M.GTP6.E behavior
  seg6: add support for the End.M.GTP6.D behavior
  seg6: add support for the End.M.GTP6.D.Di behavior
  seg6: add support for the H.M.GTP4.D behavior

 include/uapi/linux/seg6_local.h |  17 +++
 ip/ip_common.h                  |   2 +-
 ip/ipnexthop.c                  |   2 +-
 ip/iproute.c                    |  14 +-
 ip/iproute_lwtunnel.c           | 263 +++++++++++++++++++++++++++++++-
 man/man8/ip-route.8.in          | 154 +++++++++++++++++++
 6 files changed, 442 insertions(+), 10 deletions(-)


base-commit: 4f5de57e2ff11a5925dacdf3deeeabee7ba9502a
-- 
2.50.1