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| author | Patrick McHardy <kaber@trash.net> | 2008-01-22 22:10:59 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 15:11:09 -0800 |
| commit | 01480e1cf5e2118eba8a8968239f3242072f9563 (patch) | |
| tree | c967ad4acfeb3929ff191457a45fdb47eaf94bdb /net | |
| parent | 2eb9d75c723252c1fa8f0206e6a0df220e3c64c0 (diff) | |
| download | lwn-01480e1cf5e2118eba8a8968239f3242072f9563.tar.gz lwn-01480e1cf5e2118eba8a8968239f3242072f9563.zip | |
[NETLINK]: Add nla_append()
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netlink/attr.c | 19 |
1 files changed, 19 insertions, 0 deletions
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); |