#include <linux/types.h>
#include <linux/netlink.h>
+#include <linux/jiffies.h>
/* ========================================================================
* Netlink Messages and Attributes Interface (As Seen On TV)
* nla_next(nla)-----------------------------'
*
* Data Structures:
- * struct nlattr netlink attribtue header
+ * struct nlattr netlink attribute header
*
* Attribute Construction:
* 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
+ * 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
* Nested Attributes Construction:
* nla_nest_start(skb, type) start a nested attribute
* nla_nest_end(skb, nla) finalize a nested attribute
+ * nla_nest_compat_start(skb, type, start a nested compat attribute
+ * len, data)
+ * nla_nest_compat_end(skb, type) finalize a nested compat attribute
* nla_nest_cancel(skb, nla) cancel nested attribute construction
*
* Attribute Length Calculations:
* 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_parse_nested_compat() parse nested compat attributes
* nla_for_each_attr() loop over all attributes
* nla_for_each_nested() loop over the nested attributes
*=========================================================================
NLA_FLAG,
NLA_MSECS,
NLA_NESTED,
+ NLA_NESTED_COMPAT,
NLA_NUL_STRING,
+ NLA_BINARY,
__NLA_TYPE_MAX,
};
* 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
+ * NLA_NESTED_COMPAT Exact length of structure 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, len = BARSIZ },
+ * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
* [ATTR_BAZ] = { .len = sizeof(struct mystruct) },
* };
*/
*/
struct nl_info {
struct nlmsghdr *nlh;
+ struct net *nl_net;
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);
+extern int netlink_rcv_skb(struct sk_buff *skb,
+ int (*cb)(struct sk_buff *,
+ 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);
+ const struct nla_policy *policy);
extern int nla_parse(struct nlattr *tb[], int maxtype,
struct nlattr *head, int len,
- struct nla_policy *policy);
+ const struct nla_policy *policy);
extern struct nlattr * nla_find(struct nlattr *head, int len, int attrtype);
extern size_t nla_strlcpy(char *dst, const struct nlattr *nla,
size_t dstsize);
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
*/
static inline int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen,
struct nlattr *tb[], int maxtype,
- struct nla_policy *policy)
+ const struct nla_policy *policy)
{
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
return -EINVAL;
* @policy: validation policy
*/
static inline int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype,
- struct nla_policy *policy)
+ const struct nla_policy *policy)
{
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
return -EINVAL;
/**
* 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, gfp_t flags)
+static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags)
{
- return alloc_skb(size, flags);
+ 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;
}
*/
static inline void *nlmsg_get_pos(struct sk_buff *skb)
{
- return skb->tail;
+ return skb_tail_pointer(skb);
}
/**
*
* Trims the message to the provided mark. Returns -1.
*/
-static inline int nlmsg_trim(struct sk_buff *skb, void *mark)
+static inline int nlmsg_trim(struct sk_buff *skb, const void *mark)
{
if (mark)
skb_trim(skb, (unsigned char *) mark - skb->data);
}
/**
+ * nla_type - attribute type
+ * @nla: netlink attribute
+ */
+static inline int nla_type(const struct nlattr *nla)
+{
+ return nla->nla_type & NLA_TYPE_MASK;
+}
+
+/**
* nla_data - head of payload
* @nla: netlink attribute
*/
}
/**
- * nla_next - next netlink attribte in attribute stream
+ * nla_next - next netlink attribute in attribute stream
* @nla: netlink attribute
* @remaining: number of bytes remaining in attribute stream
*
*/
static inline int nla_parse_nested(struct nlattr *tb[], int maxtype,
struct nlattr *nla,
- struct nla_policy *policy)
+ const struct nla_policy *policy)
{
return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy);
}
+
+/**
+ * nla_parse_nested_compat - parse nested compat attributes
+ * @tb: destination array with maxtype+1 elements
+ * @maxtype: maximum attribute type to be expected
+ * @nla: attribute containing the nested attributes
+ * @data: pointer to point to contained structure
+ * @len: length of contained structure
+ * @policy: validation policy
+ *
+ * Parse a nested compat attribute. The compat attribute contains a structure
+ * and optionally a set of nested attributes. On success the data pointer
+ * points to the nested data and tb contains the parsed attributes
+ * (see nla_parse).
+ */
+static inline int __nla_parse_nested_compat(struct nlattr *tb[], int maxtype,
+ struct nlattr *nla,
+ const struct nla_policy *policy,
+ int len)
+{
+ int nested_len = nla_len(nla) - NLA_ALIGN(len);
+
+ if (nested_len < 0)
+ return -1;
+ if (nested_len >= nla_attr_size(0))
+ return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len),
+ nested_len, policy);
+ memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
+ return 0;
+}
+
+#define nla_parse_nested_compat(tb, maxtype, nla, policy, data, len) \
+({ data = nla_len(nla) >= len ? nla_data(nla) : NULL; \
+ __nla_parse_nested_compat(tb, maxtype, nla, policy, len); })
/**
- * nla_put_u8 - Add a u16 netlink attribute to a socket buffer
+ * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
* @skb: socket buffer to add attribute to
* @attrtype: attribute type
* @value: numeric value
#define NLA_PUT(skb, attrtype, attrlen, data) \
do { \
- if (nla_put(skb, attrtype, attrlen, data) < 0) \
+ if (unlikely(nla_put(skb, attrtype, attrlen, data) < 0)) \
goto nla_put_failure; \
} while(0)
#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_BE16(skb, attrtype, value) \
+ NLA_PUT_TYPE(skb, __be16, 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)
}
/**
+ * 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
*/
}
/**
+ * nla_get_be16 - return payload of __be16 attribute
+ * @nla: __be16 netlink attribute
+ */
+static inline __be16 nla_get_be16(struct nlattr *nla)
+{
+ return *(__be16 *) 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;
/**
* nla_nest_end - Finalize nesting of attributes
- * @skb: socket buffer the attribtues are stored in
+ * @skb: socket buffer the attributes are stored in
* @start: container attribute
*
* Corrects the container attribute header to include the all
*/
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;
}
/**
+ * nla_nest_compat_start - Start a new level of nested compat attributes
+ * @skb: socket buffer to add attributes to
+ * @attrtype: attribute type of container
+ * @attrlen: length of structure
+ * @data: pointer to structure
+ *
+ * Start a nested compat attribute that contains both a structure and
+ * a set of nested attributes.
+ *
+ * Returns the container attribute
+ */
+static inline struct nlattr *nla_nest_compat_start(struct sk_buff *skb,
+ int attrtype, int attrlen,
+ const void *data)
+{
+ struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb);
+
+ if (nla_put(skb, attrtype, attrlen, data) < 0)
+ return NULL;
+ if (nla_nest_start(skb, attrtype) == NULL) {
+ nlmsg_trim(skb, start);
+ return NULL;
+ }
+ return start;
+}
+
+/**
+ * nla_nest_compat_end - Finalize nesting of compat attributes
+ * @skb: socket buffer the attributes are stored in
+ * @start: container attribute
+ *
+ * Corrects the container attribute header to include the all
+ * appeneded attributes.
+ *
+ * Returns the total data length of the skb.
+ */
+static inline int nla_nest_compat_end(struct sk_buff *skb, struct nlattr *start)
+{
+ struct nlattr *nest = (void *)start + NLMSG_ALIGN(start->nla_len);
+
+ start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;
+ return nla_nest_end(skb, nest);
+}
+
+/**
* nla_nest_cancel - Cancel nesting of attributes
* @skb: socket buffer the message is stored in
* @start: container attribute
}
/**
+ * 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,
+ const struct nla_policy *policy)
+{
+ return nla_validate(nla_data(start), nla_len(start), maxtype, policy);
+}
+
+/**
* nla_for_each_attr - iterate over a stream of attributes
* @pos: loop counter, set to current attribute
* @head: head of attribute stream
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff