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authorThomas Graf <tgraf@suug.ch>2005-06-19 01:50:12 -0400
committerDavid S. Miller <davem@davemloft.net>2005-06-19 01:50:12 -0400
commitf88a10d65620d97b6d0a7e352a3493c1b7e7409b (patch)
tree8d38311e479d5deb11cfab2c052c83c8b1321132 /include/linux
parente52c1f17e4ea8e61bd26eb25f1a184202693c2b9 (diff)
[NETLINK]: New message building macros
NLMSG_PUT_ANSWER(skb, nlcb, type, length) Start a new netlink message as answer to a request, returns the message header. NLMSG_END(skb, nlh) End a netlink message, fixes total message length, returns skb->len. NLMSG_CANCEL(skb, nlh) Cancel the building process and trim whole message from skb again, returns -1. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/netlink.h17
1 files changed, 15 insertions, 2 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index b2738ac8bc99..8d1cb419a930 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -171,8 +171,21 @@ __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len)
171} 171}
172 172
173#define NLMSG_PUT(skb, pid, seq, type, len) \ 173#define NLMSG_PUT(skb, pid, seq, type, len) \
174({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \ 174({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
175 __nlmsg_put(skb, pid, seq, type, len); }) 175 goto nlmsg_failure; \
176 __nlmsg_put(skb, pid, seq, type, len); })
177
178#define NLMSG_PUT_ANSWER(skb, cb, type, len) \
179 NLMSG_PUT(skb, NETLINK_CB((cb)->skb).pid, \
180 (cb)->nlh->nlmsg_seq, type, len)
181
182#define NLMSG_END(skb, nlh) \
183({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
184 (skb)->len; })
185
186#define NLMSG_CANCEL(skb, nlh) \
187({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
188 -1; })
176 189
177extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 190extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
178 struct nlmsghdr *nlh, 191 struct nlmsghdr *nlh,