diff options
| author | Thomas Graf <tgraf@suug.ch> | 2005-06-18 22:50:12 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-06-18 22:50:12 -0700 |
| commit | f88a10d65620d97b6d0a7e352a3493c1b7e7409b (patch) | |
| tree | 8d38311e479d5deb11cfab2c052c83c8b1321132 /include/linux/netlink.h | |
| parent | e52c1f17e4ea8e61bd26eb25f1a184202693c2b9 (diff) | |
| download | lwn-f88a10d65620d97b6d0a7e352a3493c1b7e7409b.tar.gz lwn-f88a10d65620d97b6d0a7e352a3493c1b7e7409b.zip | |
[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/netlink.h')
| -rw-r--r-- | include/linux/netlink.h | 17 |
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) } #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, |