kernel/linux.git/include/net/rtnetlink.h, branch v5.15.219

rtnetlink: add RTNL_FLAG_DUMP_UNLOCKED flag

2026-07-24T13:51:42+00:00

[ Upstream commit 386520e0ecc01004d3a29c70c5a77d4bbf8a8420 ] Similarly to RTNL_FLAG_DOIT_UNLOCKED, this new flag allows dump operations registered via rtnl_register() or rtnl_register_module() to opt-out from RTNL protection. Signed-off-by: Eric Dumazet Reviewed-by: Donald Hunter Signed-off-by: David S. Miller Stable-dep-of: 9facb861dc6b ("ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump") Signed-off-by: Sasha Levin

net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink

2026-07-24T13:51:16+00:00

[ Upstream commit 8165f7ff57d9667d2bb477ef6af83ede7fed4ad7 ] A tunnel changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net. Add rtnl_dev_link_net_capable() next to rtnl_get_net_ns_capable() in net/core/rtnetlink.c. It requires CAP_NET_ADMIN in the link netns and is skipped when the link netns is dev_net(dev), where the rtnl path already checked it. The other patches in this series use the same helper. Gate ipgre_changelink() and erspan_changelink() with it, at the top of the op before any attribute is parsed, because the parsers update live tunnel fields first. ipgre_netlink_parms() sets t->collect_md before ip_tunnel_changelink() runs. Commit 8b484efd5cb4 ("ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate().") added the same check on the ioctl path. This adds it on RTM_NEWLINK. Reported-by: Xiao Liang Closes: https://lore.kernel.org/netdev/CABAhCOSzP1vaThGV35_VnsRCb=87_CPjPVsTHbq905k8A+BuUg@mail.gmail.com/ Fixes: b57708add314 ("gre: add x-netns support") Cc: stable@vger.kernel.org Signed-off-by: Maoyi Xie Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20260612085941.3158249-2-maoyixie.tju@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

net: rtnetlink: add bulk delete support flag

2025-10-29T13:03:11+00:00

[ Upstream commit a6cec0bcd34264be8887791594be793b3f12719f ] 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 Stable-dep-of: bf29555f5bdc ("rtnetlink: Allow deleting FDB entries in user namespace") Signed-off-by: Sasha Levin

net: rtnetlink: use BIT for flag values

2025-10-29T13:03:10+00:00

[ Upstream commit 0569e31f1bc2f50613ba4c219f3ecc0d1174d841 ] Use BIT to define flag values. Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller Stable-dep-of: bf29555f5bdc ("rtnetlink: Allow deleting FDB entries in user namespace") Signed-off-by: Sasha Levin

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

2025-10-29T13:03:10+00:00

[ Upstream commit 2e9ea3e30f696fd438319c07836422bb0bbb4608 ] 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 Stable-dep-of: bf29555f5bdc ("rtnetlink: Allow deleting FDB entries in user namespace") Signed-off-by: Sasha Levin

rtnetlink: Add bulk registration helpers for rtnetlink message handlers.

2024-10-17T13:11:57+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: d51705614f66 ("mctp: Handle error of rtnl_register_module().") Signed-off-by: Sasha Levin

net: rtnetlink: add msg kind names

2024-10-17T13:11:57+00:00

[ Upstream commit 12dc5c2cb7b269c5a1c6d02844f40bfce942a7a6 ] 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 Stable-dep-of: d51705614f66 ("mctp: Handle error of rtnl_register_module().") Signed-off-by: Sasha Levin

net: validate veth and vxcan peer ifindexes

2023-08-30T14:18:14+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: 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