diff options
Diffstat (limited to 'include/net/netlink.h')
| -rw-r--r-- | include/net/netlink.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index e015ffbed819..1a8356ca4b78 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -68,6 +68,8 @@ * nlmsg_for_each_msg() loop over all messages * nlmsg_validate() validate netlink message incl. attrs * nlmsg_for_each_attr() loop over all attributes + * nlmsg_for_each_attr_type() loop over all attributes with the + * given type * * Misc: * nlmsg_report() report back to application? @@ -118,6 +120,7 @@ * nla_nest_start(skb, type) start a nested attribute * nla_nest_end(skb, nla) finalize a nested attribute * nla_nest_cancel(skb, nla) cancel nested attribute construction + * nla_put_empty_nest(skb, type) create an empty nest * * Attribute Length Calculations: * nla_attr_size(payload) length of attribute w/o padding @@ -320,7 +323,13 @@ enum nla_policy_validation { * All other Unused - but note that it's a union * * Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN: + * NLA_U8, NLA_U16, + * NLA_U32, NLA_U64, + * NLA_S8, NLA_S16, + * NLA_S32, NLA_S64, + * NLA_MSECS, * NLA_BINARY Validation function called for the attribute. + * * All other Unused - but note that it's a union * * Example: @@ -611,6 +620,22 @@ static inline int nlmsg_len(const struct nlmsghdr *nlh) } /** + * nlmsg_payload - message payload if the data fits in the len + * @nlh: netlink message header + * @len: struct length + * + * Returns: The netlink message payload/data if the length is sufficient, + * otherwise NULL. + */ +static inline void *nlmsg_payload(const struct nlmsghdr *nlh, size_t len) +{ + if (nlh->nlmsg_len < nlmsg_msg_size(len)) + return NULL; + + return nlmsg_data(nlh); +} + +/** * nlmsg_attrdata - head of attributes data * @nlh: netlink message header * @hdrlen: length of family specific header @@ -944,6 +969,18 @@ static inline u32 nlmsg_seq(const struct nlmsghdr *nlh) nlmsg_attrlen(nlh, hdrlen), rem) /** + * nlmsg_for_each_attr_type - iterate over a stream of attributes + * @pos: loop counter, set to the current attribute + * @type: required attribute type for @pos + * @nlh: netlink message header + * @hdrlen: length of the family specific header + * @rem: initialized to len, holds bytes currently remaining in stream + */ +#define nlmsg_for_each_attr_type(pos, type, nlh, hdrlen, rem) \ + nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ + if (nla_type(pos) == type) + +/** * nlmsg_put - Add a new netlink message to an skb * @skb: socket buffer to store message in * @portid: netlink PORTID of requesting application @@ -2241,6 +2278,20 @@ static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) } /** + * nla_put_empty_nest - Create an empty nest + * @skb: socket buffer the message is stored in + * @attrtype: attribute type of the container + * + * This function is a helper for creating empty nests. + * + * Returns: 0 when successful or -EMSGSIZE on failure. + */ +static inline int nla_put_empty_nest(struct sk_buff *skb, int attrtype) +{ + return nla_nest_start(skb, attrtype) ? 0 : -EMSGSIZE; +} + +/** * __nla_validate_nested - Validate a stream of nested attributes * @start: container attribute * @maxtype: maximum attribute type to be expected |