From 01480e1cf5e2118eba8a8968239f3242072f9563 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Tue, 22 Jan 2008 22:10:59 -0800 Subject: [NETLINK]: Add nla_append() Used to append data to a message without a header or padding. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netlink/attr.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'net/netlink') diff --git a/net/netlink/attr.c b/net/netlink/attr.c index ec39d12c2423..feb326f4a752 100644 --- a/net/netlink/attr.c +++ b/net/netlink/attr.c @@ -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); -- cgit v1.2.3