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platform/netlink: add nlmsg_undata() helper

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Thomas Haller 2022-08-05 22:00:12 +02:00
parent c74c783c28
commit 6e7d8f0335
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GPG key ID: 29C2366E4DFC5728
1 changed files with 9 additions and 2 deletions
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11
src/libnm-platform/nm-netlink.h
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@ -442,16 +442,23 @@ void nlmsg_set_creds(struct nl_msg *msg, struct ucred *creds);
NM_AUTO_DEFINE_FCN0(struct nl_msg *, _nm_auto_nl_msg_cleanup, nlmsg_free);
#define nm_auto_nlmsg nm_auto(_nm_auto_nl_msg_cleanup)
static inline const struct nlmsghdr *
nlmsg_undata(const void *data)
{
/* from the data, get back the header. It's the inverse of nlmsg_data(). */
return (void *) (((unsigned char *) data) - NLMSG_HDRLEN);
}
static inline void *
nlmsg_data(const struct nlmsghdr *nlh)
{
return (unsigned char *) nlh + NLMSG_HDRLEN;
return ((unsigned char *) nlh) + NLMSG_HDRLEN;
}
static inline void *
nlmsg_tail(const struct nlmsghdr *nlh)
{
return (unsigned char *) nlh + NLMSG_ALIGN(nlh->nlmsg_len);
return ((unsigned char *) nlh) + NLMSG_ALIGN(nlh->nlmsg_len);
}
struct nlmsghdr *nlmsg_hdr(const struct nl_msg *n);