linux.git/include/net/rtnetlink.h, branch v6.1.168

rtnetlink: Honour NLM_F_ECHO flag in rtnl_delete_link

2026-04-11T12:16:07+00:00

[ Upstream commit f3a63cce1b4fbde7738395c5a2dea83f05de3407 ]

This patch use the new helper unregister_netdevice_many_notify() for
rtnl_delete_link(), so that the kernel could reply unicast when userspace
 set NLM_F_ECHO flag to request the new created interface info.

At the same time, the parameters of rtnl_delete_link() need to be updated
since we need nlmsghdr and portid info.

Suggested-by: Guillaume Nault 
Signed-off-by: Hangbin Liu 
Reviewed-by: Guillaume Nault 
Signed-off-by: Jakub Kicinski 
Stable-dep-of: 6931d21f87bc ("openvswitch: defer tunnel netdev_put to RCU release")
Signed-off-by: Sasha Levin

rtnetlink: pass netlink message header and portid to rtnl_configure_link()

2026-04-11T12:16:06+00:00

[ Upstream commit 1d997f1013079c05b642c739901e3584a3ae558d ]

This patch pass netlink message header and portid to rtnl_configure_link()
All the functions in this call chain need to add the parameters so we can
use them in the last call rtnl_notify(), and notify the userspace about
the new link info if NLM_F_ECHO flag is set.

- rtnl_configure_link()
  - __dev_notify_flags()
    - rtmsg_ifinfo()
      - rtmsg_ifinfo_event()
        - rtmsg_ifinfo_build_skb()
        - rtmsg_ifinfo_send()
	  - rtnl_notify()

Also move __dev_notify_flags() declaration to net/core/dev.h, as Jakub
suggested.

Signed-off-by: Hangbin Liu 
Reviewed-by: Guillaume Nault 
Signed-off-by: Jakub Kicinski 
Stable-dep-of: 6931d21f87bc ("openvswitch: defer tunnel netdev_put to RCU release")
Signed-off-by: Sasha Levin

rtnetlink: Add bulk registration helpers for rtnetlink message handlers.

2024-10-17T13:22:23+00:00

[ Upstream commit 07cc7b0b942bf55ef1a471470ecda8d2a6a6541f ]

Before commit addf9b90de22 ("net: rtnetlink: use rcu to free rtnl message
handlers"), once rtnl_msg_handlers[protocol] was allocated, the following
rtnl_register_module() for the same protocol never failed.

However, after the commit, rtnl_msg_handler[protocol][msgtype] needs to
be allocated in each rtnl_register_module(), so each call could fail.

Many callers of rtnl_register_module() do not handle the returned error,
and we need to add many error handlings.

To handle that easily, let's add wrapper functions for bulk registration
of rtnetlink message handlers.

Signed-off-by: Kuniyuki Iwashima 
Signed-off-by: Paolo Abeni 
Stable-dep-of: 78b7b991838a ("vxlan: Handle error of rtnl_register_module().")
Signed-off-by: Sasha Levin

net: validate veth and vxcan peer ifindexes

2023-08-30T14:11:02+00:00

[ Upstream commit f534f6581ec084fe94d6759f7672bd009794b07e ]

veth and vxcan need to make sure the ifindexes of the peer
are not negative, core does not validate this.

Using iproute2 with user-space-level checking removed:

Before:

  # ./ip link add index 10 type veth peer index -1
  # ip link show
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  2: enp1s0:  mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 52:54:00:74:b2:03 brd ff:ff:ff:ff:ff:ff
  10: veth1@veth0:  mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 8a:90:ff:57:6d:5d brd ff:ff:ff:ff:ff:ff
  -1: veth0@veth1:  mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether ae:ed:18:e6:fa:7f brd ff:ff:ff:ff:ff:ff

Now:

  $ ./ip link add index 10 type veth peer index -1
  Error: ifindex can't be negative.

This problem surfaced in net-next because an explicit WARN()
was added, the root cause is older.

Fixes: e6f8f1a739b6 ("veth: Allow to create peer link with given ifindex")
Fixes: a8f820a380a2 ("can: add Virtual CAN Tunnel driver (vxcan)")
Reported-by: syzbot+5ba06978f34abb058571@syzkaller.appspotmail.com
Signed-off-by: Jakub Kicinski 
Reviewed-by: Eric Dumazet 
Signed-off-by: David S. Miller 
Signed-off-by: Sasha Levin

net: rtnetlink: add bulk delete support flag

2022-04-13T11:46:26+00:00

Add a new rtnl flag (RTNL_FLAG_BULK_DEL_SUPPORTED) which is used to
verify that the delete operation allows bulk object deletion. Also emit
a warning if anyone tries to set it for non-delete kind.

Suggested-by: David Ahern 
Signed-off-by: Nikolay Aleksandrov 
Signed-off-by: David S. Miller

net: rtnetlink: use BIT for flag values

2022-04-13T11:46:25+00:00

Use BIT to define flag values.

Signed-off-by: Nikolay Aleksandrov 
Signed-off-by: David S. Miller

net: rtnetlink: add helper to extract msg type's kind

2022-04-13T11:46:25+00:00

Add a helper which extracts the msg type's kind using the kind mask (0x3).

Signed-off-by: Nikolay Aleksandrov 
Signed-off-by: David S. Miller

net: rtnetlink: add msg kind names

2022-04-13T11:46:25+00:00

Add rtnl kind names instead of using raw values. We'll need to
check for DEL kind later to validate bulk flag support.

Signed-off-by: Nikolay Aleksandrov 
Signed-off-by: David S. Miller

net: add extack arg for link ops

2021-08-04T09:01:26+00:00

Pass extack arg to validate_linkmsg and validate_link_af callbacks.
If a netlink attribute has a reject_message, use the extended ack
mechanism to carry the message back to user space.

Signed-off-by: Rocco Yue 
Reviewed-by: David Ahern 
Signed-off-by: David S. Miller

rtnetlink: add alloc() method to rtnl_link_ops

2021-06-12T20:16:45+00:00

In order to make rtnetlink ops that can create different
kinds of devices, like what we want to add to the WWAN
framework, the priv_size and setup parameters aren't quite
sufficient. Make this easier to manage by allowing ops to
allocate their own netdev via an @alloc method that gets
the tb netlink data.

Signed-off-by: Johannes Berg 
Signed-off-by: Sergey Ryazanov 
Signed-off-by: David S. Miller