kernel/linux.git/net/ipv6/sit.c, branch v6.19.11

ipv6: sit: Add ipip6_tunnel_dst_find() for cleanup

2025-09-04T08:03:59+00:00

Extract the dst lookup logic from ipip6_tunnel_xmit() into new helper ipip6_tunnel_dst_find() to reduce code duplication and enhance readability. No functional change intended. On a x86_64, with allmodconfig object size is also reduced: ./scripts/bloat-o-meter net/ipv6/sit.o net/ipv6/sit-new.o add/remove: 5/3 grow/shrink: 3/4 up/down: 1841/-2275 (-434) Function old new delta ipip6_tunnel_dst_find - 1697 +1697 __pfx_ipip6_tunnel_dst_find - 64 +64 __UNIQUE_ID_modinfo2094 - 43 +43 ipip6_tunnel_xmit.isra.cold 79 88 +9 __UNIQUE_ID_modinfo2096 12 20 +8 __UNIQUE_ID___addressable_init_module2092 - 8 +8 __UNIQUE_ID___addressable_cleanup_module2093 - 8 +8 __func__ 55 59 +4 __UNIQUE_ID_modinfo2097 20 18 -2 __UNIQUE_ID___addressable_init_module2093 8 - -8 __UNIQUE_ID___addressable_cleanup_module2094 8 - -8 __UNIQUE_ID_modinfo2098 18 - -18 __UNIQUE_ID_modinfo2095 43 12 -31 descriptor 112 56 -56 ipip6_tunnel_xmit.isra 9910 7758 -2152 Total: Before=72537, After=72103, chg -0.60% Signed-off-by: Yue Haibing Reviewed-by: Alexander Lobakin Link: https://patch.msgid.link/20250901114857.1968513-1-yuehaibing@huawei.com Signed-off-by: Paolo Abeni

net: ipv4: Add a flags argument to iptunnel_xmit(), udp_tunnel_xmit_skb()

2025-06-18T01:18:44+00:00

iptunnel_xmit() erases the contents of the SKB control block. In order to be able to set particular IPCB flags on the SKB, add a corresponding parameter, and propagate it to udp_tunnel_xmit_skb() as well. In one of the following patches, VXLAN driver will use this facility to mark packets as subject to IP multicast routing. Signed-off-by: Petr Machata Reviewed-by: Ido Schimmel Reviewed-by: Nikolay Aleksandrov Acked-by: Antonio Quartulli Link: https://patch.msgid.link/89c9daf9f2dc088b6b92ccebcc929f51742de91f.1750113335.git.petrm@nvidia.com Signed-off-by: Jakub Kicinski

ipv6: Convert tunnel devices' ->exit_batch_rtnl() to ->exit_rtnl().

2025-04-15T00:08:42+00:00

The following functions iterates the dying netns list and performs the same operations for each netns. * ip6gre_exit_batch_rtnl() * ip6_tnl_exit_batch_rtnl() * vti6_exit_batch_rtnl() * sit_exit_batch_rtnl() Let's use ->exit_rtnl(). Signed-off-by: Kuniyuki Iwashima Reviewed-by: David Ahern Reviewed-by: Sabrina Dubroca Link: https://patch.msgid.link/20250411205258.63164-8-kuniyu@amazon.com Signed-off-by: Jakub Kicinski

net: move misc netdev_lock flavors to a separate header

2025-03-08T17:06:50+00:00

Move the more esoteric helpers for netdev instance lock to a dedicated header. This avoids growing netdevice.h to infinity and makes rebuilding the kernel much faster (after touching the header with the helpers). The main netdev_lock() / netdev_unlock() functions are used in static inlines in netdevice.h and will probably be used most commonly, so keep them in netdevice.h. Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250307183006.2312761-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

net: rename netns_local to netns_immutable

2025-03-04T11:44:48+00:00

The name 'netns_local' is confusing. A following commit will export it via netlink, so let's use a more explicit name. Reported-by: Eric Dumazet Suggested-by: Kuniyuki Iwashima Signed-off-by: Nicolas Dichtel Reviewed-by: Kuniyuki Iwashima Signed-off-by: Paolo Abeni

net: ipv6: Use link netns in newlink() of rtnl_link_ops

2025-02-21T23:28:02+00:00

When link_net is set, use it as link netns instead of dev_net(). This prepares for rtnetlink core to create device in target netns directly, in which case the two namespaces may be different. Signed-off-by: Xiao Liang Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250219125039.18024-9-shaw.leon@gmail.com Signed-off-by: Jakub Kicinski

net: ipv6: Init tunnel link-netns before registering dev

2025-02-21T23:28:02+00:00

Currently some IPv6 tunnel drivers set tnl->net to dev_net(dev) in ndo_init(), which is called in register_netdevice(). However, it lacks the context of link-netns when we enable cross-net tunnels at device registration time. Let's move the init of tunnel link-netns before register_netdevice(). ip6_gre has already initialized netns, so just remove the redundant assignment. Signed-off-by: Xiao Liang Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250219125039.18024-8-shaw.leon@gmail.com Signed-off-by: Jakub Kicinski

rtnetlink: Pack newlink() params into struct

2025-02-21T23:28:02+00:00

There are 4 net namespaces involved when creating links: - source netns - where the netlink socket resides, - target netns - where to put the device being created, - link netns - netns associated with the device (backend), - peer netns - netns of peer device. Currently, two nets are passed to newlink() callback - "src_net" parameter and "dev_net" (implicitly in net_device). They are set as follows, depending on netlink attributes in the request. +------------+-------------------+---------+---------+ | peer netns | IFLA_LINK_NETNSID | src_net | dev_net | +------------+-------------------+---------+---------+ | | absent | source | target | | absent +-------------------+---------+---------+ | | present | link | link | +------------+-------------------+---------+---------+ | | absent | peer | target | | present +-------------------+---------+---------+ | | present | peer | link | +------------+-------------------+---------+---------+ When IFLA_LINK_NETNSID is present, the device is created in link netns first and then moved to target netns. This has some side effects, including extra ifindex allocation, ifname validation and link events. These could be avoided if we create it in target netns from the beginning. On the other hand, the meaning of src_net parameter is ambiguous. It varies depending on how parameters are passed. It is the effective link (or peer netns) by design, but some drivers ignore it and use dev_net instead. To provide more netns context for drivers, this patch packs existing newlink() parameters, along with the source netns, link netns and peer netns, into a struct. The old "src_net" is renamed to "net" to avoid confusion with real source netns, and will be deprecated later. The use of src_net are converted to params->net trivially. Signed-off-by: Xiao Liang Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250219125039.18024-3-shaw.leon@gmail.com Signed-off-by: Jakub Kicinski

ipv6: sit: Unmask upper DSCP bits in ipip6_tunnel_bind_dev()

2024-09-04T23:57:11+00:00

Unmask the upper DSCP bits when calling ip_route_output_ports() so that in the future it could perform the FIB lookup according to the full DSCP value. Signed-off-by: Ido Schimmel Reviewed-by: Guillaume Nault Reviewed-by: David Ahern Link: https://patch.msgid.link/20240903135327.2810535-5-idosch@nvidia.com Signed-off-by: Jakub Kicinski

netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local

2024-09-03T09:36:43+00:00

"Interface can't change network namespaces" is rather an attribute, not a feature, and it can't be changed via Ethtool. Make it a "cold" private flag instead of a netdev_feature and free one more bit. Signed-off-by: Alexander Lobakin Signed-off-by: Paolo Abeni