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authorThomas Graf <tgraf@suug.ch>2005-06-18 22:50:12 -0700
committerDavid S. Miller <davem@davemloft.net>2005-06-18 22:50:12 -0700
commitf88a10d65620d97b6d0a7e352a3493c1b7e7409b (patch)
tree8d38311e479d5deb11cfab2c052c83c8b1321132 /include
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')
-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 b2738ac8bc9..8d1cb419a93 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)
}
#define NLMSG_PUT(skb, pid, seq, type, len) \
-({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \
- __nlmsg_put(skb, pid, seq, type, len); })
+({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
+ goto nlmsg_failure; \
+ __nlmsg_put(skb, pid, seq, type, len); })
+
+#define NLMSG_PUT_ANSWER(skb, cb, type, len) \
+ NLMSG_PUT(skb, NETLINK_CB((cb)->skb).pid, \
+ (cb)->nlh->nlmsg_seq, type, len)
+
+#define NLMSG_END(skb, nlh) \
+({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
+ (skb)->len; })
+
+#define NLMSG_CANCEL(skb, nlh) \
+({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
+ -1; })
extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
struct nlmsghdr *nlh,