kernel/linux.git/include/net/netlink.h, branch v6.1.168

netlink: allow be16 and be32 types in all uint policy checks

2026-04-11T12:16:09+00:00

[ Upstream commit 5fac9b7c16c50c6c7699517f582b56e3743f453a ] __NLA_IS_BEINT_TYPE(tp) isn't useful. NLA_BE16/32 are identical to NLA_U16/32, the only difference is that it tells the netlink validation functions that byteorder conversion might be needed before comparing the value to the policy min/max ones. After this change all policy macros that can be used with UINT types, such as NLA_POLICY_MASK() can also be used with NLA_BE16/32. This will be used to validate nf_tables flag attributes which are in bigendian byte order. Signed-off-by: Florian Westphal Stable-dep-of: 8f15b5071b45 ("netfilter: ctnetlink: use netlink policy range checks") 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

netlink: split up copies in the ack construction

2023-10-10T20:00:44+00:00

[ Upstream commit 738136a0e3757a8534df3ad97d6ff6d7f429f6c1 ] Clean up the use of unsafe_memcpy() by adding a flexible array at the end of netlink message header and splitting up the header and data copies. Reviewed-by: Kees Cook Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller Stable-dep-of: d0f95894fda7 ("netlink: annotate data-races around sk->sk_err") Signed-off-by: Sasha Levin

netlink: introduce bigendian integer types

2022-11-02T04:29:06+00:00

Jakub reported that the addition of the "network_byte_order" member in struct nla_policy increases size of 32bit platforms. Instead of scraping the bit from elsewhere Johannes suggested to add explicit NLA_BE types instead, so do this here. NLA_POLICY_MAX_BE() macro is removed again, there is no need for it: NLA_POLICY_MAX(NLA_BE.., ..) will do the right thing. NLA_BE64 can be added later. Fixes: 08724ef69907 ("netlink: introduce NLA_POLICY_MAX_BE") Reported-by: Jakub Kicinski Suggested-by: Johannes Berg Signed-off-by: Florian Westphal Link: https://lore.kernel.org/r/20221031123407.9158-1-fw@strlen.de Signed-off-by: Jakub Kicinski

netlink: hide validation union fields from kdoc

2022-10-29T03:19:15+00:00

Mark the validation fields as private, users shouldn't set them directly and they are too complicated to explain in a more succinct way (there's already a long explanation in the comment above). The strict_start_type field is set directly and has a dedicated comment so move that above the "private" section. Link: https://lore.kernel.org/r/20221027212107.2639255-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

netlink: introduce NLA_POLICY_MAX_BE

2022-09-07T11:33:43+00:00

netlink allows to specify allowed ranges for integer types. Unfortunately, nfnetlink passes integers in big endian, so the existing NLA_POLICY_MAX() cannot be used. At the moment, nfnetlink users, such as nf_tables, need to resort to programmatic checking via helpers such as nft_parse_u32_check(). This is both cumbersome and error prone. This adds NLA_POLICY_MAX_BE which adds range check support for BE16, BE32 and BE64 integers. Signed-off-by: Florian Westphal Signed-off-by: David S. Miller

netlink: fix some kernel-doc comments

2022-08-25T01:46:16+00:00

Modify the comment of input parameter of nlmsg_ and nla_ function. Signed-off-by: Zhengchao Shao Link: https://lore.kernel.org/r/20220824013621.365103-1-shaozhengchao@huawei.com Signed-off-by: Jakub Kicinski

net: netlink: add the case when nlh is NULL

2021-07-27T10:43:50+00:00

Add the case when nlh is NULL in nlmsg_report(), so that the caller doesn't need to deal with this case. Signed-off-by: Yajun Deng Signed-off-by: David S. Miller

treewide: rename nla_strlcpy to nla_strscpy.

2020-11-16T16:08:54+00:00

Calls to nla_strlcpy are now replaced by calls to nla_strscpy which is the new name of this function. Signed-off-by: Francis Laniel Reviewed-by: Kees Cook Signed-off-by: Jakub Kicinski

Modify return value of nla_strlcpy to match that of strscpy.

2020-11-16T16:08:54+00:00

nla_strlcpy now returns -E2BIG if src was truncated when written to dst. It also returns this error value if dstsize is 0 or higher than INT_MAX. For example, if src is "foo\0" and dst is 3 bytes long, the result will be: 1. "foG" after memcpy (G means garbage). 2. "fo\0" after memset. 3. -E2BIG is returned because src was not completely written into dst. The callers of nla_strlcpy were modified to take into account this modification. Signed-off-by: Francis Laniel Reviewed-by: Kees Cook Signed-off-by: Jakub Kicinski