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[NETLINK]: Add nla_append()

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Used to append data to a message without a header or padding.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-01-22 22:10:59 -08:00 committed by David S. Miller
parent 2eb9d75c72
commit 01480e1cf5
2 changed files with 22 additions and 0 deletions
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3
include/net/netlink.h
View file

@ -91,6 +91,7 @@
* nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr
* nla_put(skb, type, len, data) add attribute to skb
* nla_put_nohdr(skb, len, data) add attribute w/o hdr
* nla_append(skb, len, data) append data to skb
*
* Attribute Construction for Basic Types:
* nla_put_u8(skb, type, value) add u8 attribute to skb
@ -254,6 +255,8 @@ extern int nla_put(struct sk_buff *skb, int attrtype,
int attrlen, const void *data);
extern int nla_put_nohdr(struct sk_buff *skb, int attrlen,
const void *data);
extern int nla_append(struct sk_buff *skb, int attrlen,
const void *data);
/**************************************************************************
* Netlink Messages

19
net/netlink/attr.c
View file

@ -430,6 +430,24 @@ int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data)
return 0;
}
/**
* nla_append - Add a netlink attribute without header or padding
* @skb: socket buffer to add attribute to
* @attrlen: length of attribute payload
* @data: head of attribute payload
*
* Returns -1 if the tailroom of the skb is insufficient to store
* the attribute payload.
*/
int nla_append(struct sk_buff *skb, int attrlen, const void *data)
{
if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
return -1;
memcpy(skb_put(skb, attrlen), data, attrlen);
return 0;
}
EXPORT_SYMBOL(nla_validate);
EXPORT_SYMBOL(nla_parse);
EXPORT_SYMBOL(nla_find);
@ -445,3 +463,4 @@ EXPORT_SYMBOL(nla_put_nohdr);
EXPORT_SYMBOL(nla_memcpy);
EXPORT_SYMBOL(nla_memcmp);
EXPORT_SYMBOL(nla_strcmp);
EXPORT_SYMBOL(nla_append);