diff options
| author | Breno Leitao <leitao@debian.org> | 2025-04-14 06:24:07 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-04-15 08:28:53 -0700 |
| commit | 95d06e92a401928fe46fda7616e460f39cb7211b (patch) | |
| tree | aa3480121f0234badab9853aa82962929b0b3020 | |
| parent | 0418711f60bbc6c35ba21fc78c6e3bc913036d2f (diff) | |
netlink: Introduce nlmsg_payload helper
Create a new helper function, nlmsg_payload(), to simplify checking and
retrieving Netlink message payloads.
This reduces boilerplate code for users who need to verify the message
length before accessing its data.
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250414-nlmsg-v2-1-3d90cb42c6af@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | include/net/netlink.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index 29e0db940382..82e07e272290 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -612,6 +612,22 @@ static inline int nlmsg_len(const struct nlmsghdr *nlh) } /** + * nlmsg_payload - message payload if the data fits in the len + * @nlh: netlink message header + * @len: struct length + * + * Returns: The netlink message payload/data if the length is sufficient, + * otherwise NULL. + */ +static inline void *nlmsg_payload(const struct nlmsghdr *nlh, size_t len) +{ + if (nlh->nlmsg_len < nlmsg_msg_size(len)) + return NULL; + + return nlmsg_data(nlh); +} + +/** * nlmsg_attrdata - head of attributes data * @nlh: netlink message header * @hdrlen: length of family specific header |