netlink: simplify NLMSG_DATA with NLMSG_HDRLEN

The NLMSG_LENGTH(0) may confuse the API users, NLMSG_HDRLEN is much more clear. Besides, some code style problems are also fixed. Signed-off-by: Chen Li <chenli@uniontech.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Chen Li committed 5 years ago

Commit d4099891 parent 0d155171 file · +3 −2Browse files

Showing the changes to include/uapi (1 of 1 file). Show all

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include/uapi/linux/netlink.h+3−2

@@ -91,9 +91,10 @@ struct nlmsghdr { · 90 unmodified lines
91	91	#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
92	92	#define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN)
93	93	#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
94		−#define NLMSG_DATA(nlh) ((void)(((char)nlh) + NLMSG_LENGTH(0)))
	94	+#define NLMSG_DATA(nlh) ((void )(((char )nlh) + NLMSG_HDRLEN))
95	95	#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
96		− (struct nlmsghdr)(((char)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
	96	+ (struct nlmsghdr )(((char )(nlh)) + \
	97	+ NLMSG_ALIGN((nlh)->nlmsg_len)))
97	98	#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
98	99	(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
99	100	(nlh)->nlmsg_len <= (len))