Historically ip6mr was based [cut-n-paste] on ipmr and the two have not diverged too much. Apparently as ipv4 multicast routing is more common than its ipv6 brethren modifications since then are mostly one-way, affecting ipmr while leaving ip6mr unchanged.
This series is meant to re-factor both ipmr and ip6mr into having common structures [and some functionality], adding 2 new common files - mroute_base.h and ipmr_base.c. The series begins by bringing ip6mr up to speed to some of the changes applied in the past to ipmr [#2, #3]. It is then possible to re-factor a lot of the common structures - vif devices [#1], mr_table [#4] mfc_cache [#6], and use the common structures in both ipmr and ip6mr. The rest of the patches re-factor some choice flows used by both ipmr and ip6mr and eliminates duplicity. This series would later allow for easy extension of ipmr offloading to support ip6mr offloading as well, as almost all structures related to the offloading would be shared between the two protocols. Yuval Mintz (11): ipmr,ipmr6: Define a uniform vif_device ip6mr: Make mroute_sk rcu-based ip6mr: Align hash implementation to ipmr mroute*: Make mr_table a common struct ipmr, ip6mr: Unite creation of new mr_table ipmr, ip6mr: Make mfc_cache a common structure ipmr, ip6mr: Unite logic for searching in MFC cache ipmr, ip6mr: Unite mfc seq logic ipmr, ip6mr: Unite vif seq logic ip6mr: Remove MFC_NOTIFY and refactor flags ipmr, ip6mr: Unite dumproute flows drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c | 21 +- include/linux/mroute.h | 88 +- include/linux/mroute6.h | 62 +- include/linux/mroute_base.h | 346 ++++++++ include/net/netns/ipv6.h | 2 +- net/ipv4/Kconfig | 5 + net/ipv4/Makefile | 1 + net/ipv4/ipmr.c | 576 ++++--------- net/ipv4/ipmr_base.c | 323 +++++++ net/ipv6/Kconfig | 1 + net/ipv6/ip6_output.c | 2 +- net/ipv6/ip6mr.c | 984 ++++++++-------------- 12 files changed, 1240 insertions(+), 1171 deletions(-) create mode 100644 include/linux/mroute_base.h create mode 100644 net/ipv4/ipmr_base.c -- 2.4.3
