#include <linux/types.h>
#include <linux/netlink.h>
+#include <linux/jiffies.h>
/* ========================================================================
* Netlink Messages and Attributes Interface (As Seen On TV)
* nlmsg_put() add a netlink message to an skb
* nlmsg_put_answer() callback based nlmsg_put()
* nlmsg_end() finanlize netlink message
+ * nlmsg_get_pos() return current position in message
+ * nlmsg_trim() trim part of message
* nlmsg_cancel() cancel message construction
* nlmsg_free() free a netlink message
*
* Message Sending:
* nlmsg_multicast() multicast message to several groups
* nlmsg_unicast() unicast a message to a single socket
+ * nlmsg_notify() send notification message
*
* Message Length Calculations:
* nlmsg_msg_size(payload) length of message w/o padding
* nlmsg_validate() validate netlink message incl. attrs
* nlmsg_for_each_attr() loop over all attributes
*
+ * Misc:
+ * nlmsg_report() report back to application?
+ *
* ------------------------------------------------------------------------
* Attributes Interface
* ------------------------------------------------------------------------
* struct nlattr netlink attribtue header
*
* Attribute Construction:
- * nla_reserve(skb, type, len) reserve skb tailroom for an attribute
+ * nla_reserve(skb, type, len) reserve room for an attribute
+ * 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
*
* Attribute Construction for Basic Types:
* nla_put_u8(skb, type, value) add u8 attribute to skb
* nla_ok(nla, remaining) does nla fit into remaining bytes?
* nla_next(nla, remaining) get next netlink attribute
* nla_validate() validate a stream of attributes
+ * nla_validate_nested() validate a stream of nested attributes
* nla_find() find attribute in stream of attributes
+ * nla_find_nested() find attribute in nested attributes
* nla_parse() parse and validate stream of attrs
* nla_parse_nested() parse nested attribuets
* nla_for_each_attr() loop over all attributes
+ * nla_for_each_nested() loop over the nested attributes
*=========================================================================
*/
NLA_FLAG,
NLA_MSECS,
NLA_NESTED,
+ NLA_NUL_STRING,
+ NLA_BINARY,
__NLA_TYPE_MAX,
};
/**
* struct nla_policy - attribute validation policy
* @type: Type of attribute or NLA_UNSPEC
- * @minlen: Minimal length of payload required to be available
+ * @len: Type specific length of payload
*
* Policies are defined as arrays of this struct, the array must be
* accessible by attribute type up to the highest identifier to be expected.
*
+ * Meaning of `len' field:
+ * NLA_STRING Maximum length of string
+ * NLA_NUL_STRING Maximum length of string (excluding NUL)
+ * NLA_FLAG Unused
+ * NLA_BINARY Maximum length of attribute payload
+ * All other Exact length of attribute payload
+ *
* Example:
* static struct nla_policy my_policy[ATTR_MAX+1] __read_mostly = {
* [ATTR_FOO] = { .type = NLA_U16 },
- * [ATTR_BAR] = { .type = NLA_STRING },
- * [ATTR_BAZ] = { .minlen = sizeof(struct mystruct) },
+ * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
+ * [ATTR_BAZ] = { .len = sizeof(struct mystruct) },
* };
*/
struct nla_policy {
u16 type;
- u16 minlen;
+ u16 len;
+};
+
+/**
+ * struct nl_info - netlink source information
+ * @nlh: Netlink message header of original request
+ * @pid: Netlink PID of requesting application
+ */
+struct nl_info {
+ struct nlmsghdr *nlh;
+ u32 pid;
};
extern void netlink_run_queue(struct sock *sk, unsigned int *qlen,
int (*cb)(struct sk_buff *,
- struct nlmsghdr *, int *));
-extern void netlink_queue_skip(struct nlmsghdr *nlh,
- struct sk_buff *skb);
+ struct nlmsghdr *));
+extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb,
+ u32 pid, unsigned int group, int report,
+ gfp_t flags);
extern int nla_validate(struct nlattr *head, int len, int maxtype,
struct nla_policy *policy);
extern int nla_strcmp(const struct nlattr *nla, const char *str);
extern struct nlattr * __nla_reserve(struct sk_buff *skb, int attrtype,
int attrlen);
+extern void * __nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
extern struct nlattr * nla_reserve(struct sk_buff *skb, int attrtype,
int attrlen);
+extern void * nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
extern void __nla_put(struct sk_buff *skb, int attrtype,
int attrlen, const void *data);
+extern void __nla_put_nohdr(struct sk_buff *skb, int attrlen,
+ const void *data);
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);
/**************************************************************************
* Netlink Messages
nlmsg_attrlen(nlh, hdrlen), maxtype, policy);
}
+/**
+ * nlmsg_report - need to report back to application?
+ * @nlh: netlink message header
+ *
+ * Returns 1 if a report back to the application is requested.
+ */
+static inline int nlmsg_report(struct nlmsghdr *nlh)
+{
+ return !!(nlh->nlmsg_flags & NLM_F_ECHO);
+}
+
/**
* nlmsg_for_each_attr - iterate over a stream of attributes
* @pos: loop counter, set to current attribute
/**
* nlmsg_new - Allocate a new netlink message
- * @size: maximum size of message
+ * @payload: size of the message payload
+ * @flags: the type of memory to allocate.
*
- * Use NLMSG_GOODSIZE if size isn't know and you need a good default size.
+ * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known
+ * and a good default is needed.
*/
-static inline struct sk_buff *nlmsg_new(int size)
+static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags)
{
- return alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ return alloc_skb(nlmsg_total_size(payload), flags);
}
/**
*/
static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
{
- nlh->nlmsg_len = skb->tail - (unsigned char *) nlh;
+ nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
return skb->len;
}
+/**
+ * nlmsg_get_pos - return current position in netlink message
+ * @skb: socket buffer the message is stored in
+ *
+ * Returns a pointer to the current tail of the message.
+ */
+static inline void *nlmsg_get_pos(struct sk_buff *skb)
+{
+ return skb_tail_pointer(skb);
+}
+
+/**
+ * nlmsg_trim - Trim message to a mark
+ * @skb: socket buffer the message is stored in
+ * @mark: mark to trim to
+ *
+ * Trims the message to the provided mark. Returns -1.
+ */
+static inline int nlmsg_trim(struct sk_buff *skb, const void *mark)
+{
+ if (mark)
+ skb_trim(skb, (unsigned char *) mark - skb->data);
+
+ return -1;
+}
+
/**
* nlmsg_cancel - Cancel construction of a netlink message
* @skb: socket buffer the message is stored in
*/
static inline int nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh)
{
- skb_trim(skb, (unsigned char *) nlh - skb->data);
-
- return -1;
+ return nlmsg_trim(skb, nlh);
}
/**
* @skb: netlink message as socket buffer
* @pid: own netlink pid to avoid sending to yourself
* @group: multicast group id
+ * @flags: allocation flags
*/
static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb,
- u32 pid, unsigned int group)
+ u32 pid, unsigned int group, gfp_t flags)
{
int err;
NETLINK_CB(skb).dst_group = group;
- err = netlink_broadcast(sk, skb, pid, group, GFP_KERNEL);
+ err = netlink_broadcast(sk, skb, pid, group, flags);
if (err > 0)
err = 0;
return (struct nlattr *) ((char *) nla + totlen);
}
+/**
+ * nla_find_nested - find attribute in a set of nested attributes
+ * @nla: attribute containing the nested attributes
+ * @attrtype: type of attribute to look for
+ *
+ * Returns the first attribute which matches the specified type.
+ */
+static inline struct nlattr *nla_find_nested(struct nlattr *nla, int attrtype)
+{
+ return nla_find(nla_data(nla), nla_len(nla), attrtype);
+}
+
/**
* nla_parse_nested - parse nested attributes
* @tb: destination array with maxtype+1 elements
#define NLA_PUT_U16(skb, attrtype, value) \
NLA_PUT_TYPE(skb, u16, attrtype, value)
+#define NLA_PUT_LE16(skb, attrtype, value) \
+ NLA_PUT_TYPE(skb, __le16, attrtype, value)
+
#define NLA_PUT_U32(skb, attrtype, value) \
NLA_PUT_TYPE(skb, u32, attrtype, value)
+#define NLA_PUT_BE32(skb, attrtype, value) \
+ NLA_PUT_TYPE(skb, __be32, attrtype, value)
+
#define NLA_PUT_U64(skb, attrtype, value) \
NLA_PUT_TYPE(skb, u64, attrtype, value)
#define NLA_PUT_STRING(skb, attrtype, value) \
NLA_PUT(skb, attrtype, strlen(value) + 1, value)
-#define NLA_PUT_FLAG(skb, attrtype, value) \
+#define NLA_PUT_FLAG(skb, attrtype) \
NLA_PUT(skb, attrtype, 0, NULL)
#define NLA_PUT_MSECS(skb, attrtype, jiffies) \
return *(u32 *) nla_data(nla);
}
+/**
+ * nla_get_be32 - return payload of __be32 attribute
+ * @nla: __be32 netlink attribute
+ */
+static inline __be32 nla_get_be32(struct nlattr *nla)
+{
+ return *(__be32 *) nla_data(nla);
+}
+
/**
* nla_get_u16 - return payload of u16 attribute
* @nla: u16 netlink attribute
return *(u16 *) nla_data(nla);
}
+/**
+ * nla_get_le16 - return payload of __le16 attribute
+ * @nla: __le16 netlink attribute
+ */
+static inline __le16 nla_get_le16(struct nlattr *nla)
+{
+ return *(__le16 *) nla_data(nla);
+}
+
/**
* nla_get_u8 - return payload of u8 attribute
* @nla: u8 netlink attribute
*/
static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype)
{
- struct nlattr *start = (struct nlattr *) skb->tail;
+ struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb);
if (nla_put(skb, attrtype, 0, NULL) < 0)
return NULL;
*/
static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start)
{
- start->nla_len = skb->tail - (unsigned char *) start;
+ start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;
return skb->len;
}
*/
static inline int nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
{
- if (start)
- skb_trim(skb, (unsigned char *) start - skb->data);
+ return nlmsg_trim(skb, start);
+}
- return -1;
+/**
+ * nla_validate_nested - Validate a stream of nested attributes
+ * @start: container attribute
+ * @maxtype: maximum attribute type to be expected
+ * @policy: validation policy
+ *
+ * Validates all attributes in the nested attribute stream against the
+ * specified policy. Attributes with a type exceeding maxtype will be
+ * ignored. See documenation of struct nla_policy for more details.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+static inline int nla_validate_nested(struct nlattr *start, int maxtype,
+ struct nla_policy *policy)
+{
+ return nla_validate(nla_data(start), nla_len(start), maxtype, policy);
}
/**
nla_ok(pos, rem); \
pos = nla_next(pos, &(rem)))
+/**
+ * nla_for_each_nested - iterate over nested attributes
+ * @pos: loop counter, set to current attribute
+ * @nla: attribute containing the nested attributes
+ * @rem: initialized to len, holds bytes currently remaining in stream
+ */
+#define nla_for_each_nested(pos, nla, rem) \
+ nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
+
#endif
git.openpandora.org / pandora-kernel.git / blobdiff