kernel/linux.git/net/core/rtnetlink.c, branch v7.0-rc7

rtnetlink: fix leak of SRCU struct in rtnl_link_register

2026-03-25T03:56:02+00:00

Commit 6b57ff21a310 ("rtnetlink: Protect link_ops by mutex.") swapped the EEXIST check with the init_srcu_struct, but didn't add cleanup of the SRCU struct we just allocated in case of error. Fixes: 6b57ff21a310 ("rtnetlink: Protect link_ops by mutex.") Signed-off-by: Sabrina Dubroca Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/e77fe499f9a58c547b33b5212b3596dad417cec6.1774025341.git.sd@queasysnail.net Signed-off-by: Jakub Kicinski

rtnetlink: count IFLA_INFO_SLAVE_KIND in if_nlmsg_size

2026-03-21T02:05:12+00:00

rtnl_link_get_slave_info_data_size counts IFLA_INFO_SLAVE_DATA, but rtnl_link_slave_info_fill adds both IFLA_INFO_SLAVE_DATA and IFLA_INFO_SLAVE_KIND. Fixes: ba7d49b1f0f8 ("rtnetlink: provide api for getting and setting slave info") Reviewed-by: Jiri Pirko Signed-off-by: Sabrina Dubroca Link: https://patch.msgid.link/049843b532e23cde7ddba263c0bbe35ba6f0d26d.1773919462.git.sd@queasysnail.net Signed-off-by: Jakub Kicinski

rtnetlink: count IFLA_PARENT_DEV_{NAME,BUS_NAME} in if_nlmsg_size

2026-03-21T02:05:11+00:00

Commit 00e77ed8e64d ("rtnetlink: add IFLA_PARENT_[DEV|DEV_BUS]_NAME") added those attributes to rtnl_fill_ifinfo, but forgot to extend if_nlmsg_size. Fixes: 00e77ed8e64d ("rtnetlink: add IFLA_PARENT_[DEV|DEV_BUS]_NAME") Signed-off-by: Sabrina Dubroca Link: https://patch.msgid.link/0b849da95562af45487080528d60f578636aba5c.1773919462.git.sd@queasysnail.net Signed-off-by: Jakub Kicinski

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

rtnetlink: honor RTEXT_FILTER_SKIP_STATS in IFLA_STATS

2025-11-05T00:07:37+00:00

Gathering interface statistics can be a relatively expensive operation on certain systems as it requires iterating over all the cpus. RTEXT_FILTER_SKIP_STATS was first introduced [1] to skip AF_INET6 statistics from interface dumps and it was then extended [2] to also exclude IFLA_VF_INFO. The semantics of the flag does not seem to be limited to AF_INET or VF statistics and having a way to query the interface status (e.g: carrier, address) without retrieving its statistics seems reasonable. So this patch extends the use RTEXT_FILTER_SKIP_STATS to also affect IFLA_STATS. [1] https://lore.kernel.org/all/20150911204848.GC9687@oracle.com/ [2] https://lore.kernel.org/all/20230611105108.122586-1-gal@nvidia.com/ Signed-off-by: Adrian Moreno Reviewed-by: Toke Høiland-Jørgensen Reviewed-by: Eric Dumazet Reviewed-by: Nicolas Dichtel Link: https://patch.msgid.link/20251103154006.1189707-1-amorenoz@redhat.com Signed-off-by: Jakub Kicinski

rtnetlink: Allow deleting FDB entries in user namespace

2025-10-16T23:09:56+00:00

Creating FDB entries is possible from a non-initial user namespace when having CAP_NET_ADMIN, yet, when deleting FDB entries, processes receive an EPERM because the capability is always checked against the initial user namespace. This restricts the FDB management from unprivileged containers. Drop the netlink_capable check in rtnl_fdb_del as it was originally dropped in c5c351088ae7 and reintroduced in 1690be63a27b without intention. This patch was tested using a container on GyroidOS, where it was possible to delete FDB entries from an unprivileged user namespace and private network namespace. Fixes: 1690be63a27b ("bridge: Add vlan support to static neighbors") Reviewed-by: Michael Weiß Tested-by: Harshal Gohel Signed-off-by: Johannes Wiesböck Reviewed-by: Ido Schimmel Reviewed-by: Nikolay Aleksandrov Link: https://patch.msgid.link/20251015201548.319871-1-johannes.wiesboeck@aisec.fraunhofer.de Signed-off-by: Jakub Kicinski

net: rtnetlink: fix typo in rtnl_unregister_all() comment

2025-09-30T01:31:08+00:00

Corrected "rtnl_unregster()" -> "rtnl_unregister()" in the documentation comment of "rtnl_unregister_all()" Signed-off-by: Alok Tiwari Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250929085418.49200-1-alok.a.tiwari@oracle.com Signed-off-by: Jakub Kicinski

rtnetlink: add needed_{head,tail}room attributes

2025-09-20T00:21:55+00:00

Various network interface types make use of needed_{head,tail}room values to efficiently reserve buffer space for additional encapsulation headers, such as VXLAN, Geneve, IPSec, etc. However, it is not currently possible to query these values in a generic way. Introduce ability to query the needed_{head,tail}room values of a network device via rtnetlink, such that applications that may wish to use these values can do so. For example, Cilium agent iterates over present devices based on user config (direct routing, vxlan, geneve, wireguard etc.) and in future will configure netkit in order to expose the needed_{head,tail}room into K8s pods. See b9ed315d3c4c ("netkit: Allow for configuring needed_{head,tail}room"). Suggested-by: Daniel Borkmann Signed-off-by: Alasdair McWilliam Reviewed-by: Daniel Borkmann Link: https://patch.msgid.link/20250917095543.14039-1-alasdair@mcwilliam.dev Signed-off-by: Jakub Kicinski

net: s/dev_get_flags/netif_get_flags/

2025-07-19T00:27:47+00:00

Commit cc34acd577f1 ("docs: net: document new locking reality") introduced netif_ vs dev_ function semantics: the former expects locked netdev, the latter takes care of the locking. We don't strictly follow this semantics on either side, but there are more dev_xxx handlers now that don't fit. Rename them to netif_xxx where appropriate. Signed-off-by: Stanislav Fomichev Link: https://patch.msgid.link/20250717172333.1288349-6-sdf@fomichev.me Signed-off-by: Jakub Kicinski