1 /* SPDX-License-Identifier: GPL-2.0 */
12  * ------------------------------------------------------------------------
14  * ------------------------------------------------------------------------
17  *    <--- nlmsg_total_size(payload)  --->
18  *    <-- nlmsg_msg_size(payload) ->
19  *   +----------+- - -+-------------+- - -+-------- - -
21  *   +----------+- - -+-------------+- - -+-------- - -
22  *   nlmsg_data(nlh)---^                   ^
23  *   nlmsg_next(nlh)-----------------------+
26  *    <---------------------- nlmsg_len(nlh) --------------------->
27  *    <------ hdrlen ------>       <- nlmsg_attrlen(nlh, hdrlen) ->
28  *   +----------------------+- - -+--------------------------------+
30  *   +----------------------+- - -+--------------------------------+
31  *   nlmsg_attrdata(nlh, hdrlen)---^
67  *   nlmsg_find_attr()			find an attribute in a message
75  * ------------------------------------------------------------------------
77  * ------------------------------------------------------------------------
79  * Attribute Format:
80  *    <------- nla_total_size(payload) ------->
81  *    <---- nla_attr_size(payload) ----->
82  *   +----------+- - -+- - - - - - - - - +- - -+-------- - -
84  *   +----------+- - -+- - - - - - - - - +- - -+-------- - -
85  *                     <- nla_len(nla) ->      ^
86  *   nla_data(nla)----^                        |
87  *   nla_next(nla)-----------------------------'
90  *   struct nlattr			netlink attribute header
92  * Attribute Construction:
93  *   nla_reserve(skb, type, len)	reserve room for an attribute
94  *   nla_reserve_nohdr(skb, len)	reserve room for an attribute w/o hdr
95  *   nla_put(skb, type, len, data)	add attribute to skb
96  *   nla_put_nohdr(skb, len, data)	add attribute w/o hdr
99  * Attribute Construction for Basic Types:
100  *   nla_put_u8(skb, type, value)	add u8 attribute to skb
101  *   nla_put_u16(skb, type, value)	add u16 attribute to skb
102  *   nla_put_u32(skb, type, value)	add u32 attribute to skb
104  *                     value, padattr)	add u64 attribute to skb
105  *   nla_put_s8(skb, type, value)	add s8 attribute to skb
106  *   nla_put_s16(skb, type, value)	add s16 attribute to skb
107  *   nla_put_s32(skb, type, value)	add s32 attribute to skb
109  *               padattr)		add s64 attribute to skb
110  *   nla_put_string(skb, type, str)	add string attribute to skb
111  *   nla_put_flag(skb, type)		add flag attribute to skb
113  *                 padattr)		add msecs attribute to skb
114  *   nla_put_in_addr(skb, type, addr)	add IPv4 address attribute to skb
115  *   nla_put_in6_addr(skb, type, addr)	add IPv6 address attribute to skb
118  *   nla_nest_start(skb, type)		start a nested attribute
119  *   nla_nest_end(skb, nla)		finalize a nested attribute
120  *   nla_nest_cancel(skb, nla)		cancel nested attribute construction
123  * Attribute Length Calculations:
124  *   nla_attr_size(payload)		length of attribute w/o padding
125  *   nla_total_size(payload)		length of attribute w/ padding
128  * Attribute Payload Access:
129  *   nla_data(nla)			head of attribute payload
130  *   nla_len(nla)			length of attribute payload
132  * Attribute Payload Access for Basic Types:
133  *   nla_get_uint(nla)			get payload for a uint attribute
134  *   nla_get_sint(nla)			get payload for a sint attribute
135  *   nla_get_u8(nla)			get payload for a u8 attribute
136  *   nla_get_u16(nla)			get payload for a u16 attribute
137  *   nla_get_u32(nla)			get payload for a u32 attribute
138  *   nla_get_u64(nla)			get payload for a u64 attribute
139  *   nla_get_s8(nla)			get payload for a s8 attribute
140  *   nla_get_s16(nla)			get payload for a s16 attribute
141  *   nla_get_s32(nla)			get payload for a s32 attribute
142  *   nla_get_s64(nla)			get payload for a s64 attribute
144  *   nla_get_msecs(nla)			get payload for a msecs attribute
148  * Attribute Misc:
149  *   nla_memcpy(dest, nla, count)	copy attribute into memory
150  *   nla_memcmp(nla, data, size)	compare attribute with memory area
151  *   nla_strscpy(dst, nla, size)	copy attribute to a sized string
152  *   nla_strcmp(nla, str)		compare attribute with string
154  * Attribute Parsing:
156  *   nla_next(nla, remaining)		get next netlink attribute
159  *   nla_find()				find attribute in stream of attributes
160  *   nla_find_nested()			find attribute in nested attributes
173   * Standard attribute types to specify validation policy
201 #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
223  * struct nla_policy - attribute validation policy
224  * @type: Type of attribute or NLA_UNSPEC
225  * @validation_type: type of attribute validation done in addition to
226  *	type-specific validation (e.g. range, function call), see
231  * accessible by attribute type up to the highest identifier to be expected.
237  *    NLA_BINARY           Maximum length of attribute payload
255  *    All other            Minimum length of attribute payload
258  *    NLA_BITFIELD32       This is a 32-bit bitmap/bitselector attribute and
260  *    NLA_REJECT           This attribute is always rejected and `reject_message'
264  *                         also set `len' to the max attribute number. Use the
267  *                         parse, the nested sub-policies.
269  *                         must also set `len' to the max attribute number. Use
274  *                         level down and the attribute types directly in the
290  *                         the value of the integer attribute.
294  *                         of s16 - do that using the NLA_POLICY_FULL_RANGE()
302  *    NLA_U64              If the validation_type field instead is set to
311  *    NLA_S64              If the validation_type field instead is set to
319  *                         integers) of the attribute is enforced.
321  *    All other            Unused - but note that it's a union
324  *    NLA_BINARY           Validation function called for the attribute.
325  *    All other            Unused - but note that it's a union
344 		 * @strict_start_type: first attribute to validate strictly
346 		 * This entry is special, and used for the attribute at index 0
349 		 * starts for any attribute types >= this value, also, strict
358 		 * For completely new families it should be set to 1 so that the
360 		 * it should be set at least when new attributes are added to
361 		 * the enum used by the policy, and be set to the new value that
366 		/* private: use NLA_POLICY_*() to set */
389 	_NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy)
391 	_NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy)
478  * struct nl_info - netlink source information
483  * @skip_notify_kernel: Skip selected in-kernel notifications
494  * enum netlink_validation - netlink message/attribute validation levels
495  * @NL_VALIDATE_LIBERAL: Old-style "be liberal" validation, not caring about
498  * @NL_VALIDATE_TRAILING: Reject junk data encountered after attribute parsing.
502  *	This can safely be set by the kernel when the given policy has no
505  * @NL_VALIDATE_STRICT_ATTRS: strict attribute policy parsing (e.g.
507  * @NL_VALIDATE_NESTED: Check that NLA_F_NESTED is set for NLA_NESTED(_ARRAY)
570  * nlmsg_msg_size - length of netlink message not including padding
579  * nlmsg_total_size - length of netlink message including padding
588  * nlmsg_padlen - length of padding at the message's tail
593 	return nlmsg_total_size(payload) - nlmsg_msg_size(payload);  in nlmsg_padlen()
597  * nlmsg_data - head of message payload
606  * nlmsg_len - length of message payload
611 	return nlh->nlmsg_len - NLMSG_HDRLEN;  in nlmsg_len()
615  * nlmsg_attrdata - head of attributes data
627  * nlmsg_attrlen - length of attributes data
633 	return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen);  in nlmsg_attrlen()
637  * nlmsg_ok - check if the netlink message fits into the remaining bytes
644 		nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&  in nlmsg_ok()
645 		nlh->nlmsg_len <= remaining);  in nlmsg_ok()
649  * nlmsg_next - next netlink message in message stream
659 	int totlen = NLMSG_ALIGN(nlh->nlmsg_len);  in nlmsg_next()
661 	*remaining -= totlen;  in nlmsg_next()
667  * nla_parse - Parse a stream of attributes into a tb buffer
669  * @maxtype: maximum attribute type to be expected
670  * @head: head of attribute stream
671  * @len: length of attribute stream
675  * Parses a stream of attributes and stores a pointer to each attribute in
676  * the tb array accessible via the attribute type. Attributes with a type
692  * nla_parse_deprecated - Parse a stream of attributes into a tb buffer
694  * @maxtype: maximum attribute type to be expected
695  * @head: head of attribute stream
696  * @len: length of attribute stream
700  * Parses a stream of attributes and stores a pointer to each attribute in
701  * the tb array accessible via the attribute type. Attributes with a type
717  * nla_parse_deprecated_strict - Parse a stream of attributes into a tb buffer
719  * @maxtype: maximum attribute type to be expected
720  * @head: head of attribute stream
721  * @len: length of attribute stream
725  * Parses a stream of attributes and stores a pointer to each attribute in
726  * the tb array accessible via the attribute type. Attributes with a type
743  * __nlmsg_parse - parse attributes of a netlink message
747  * @maxtype: maximum attribute type to be expected
760 	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) {  in __nlmsg_parse()
762 		return -EINVAL;  in __nlmsg_parse()
771  * nlmsg_parse - parse attributes of a netlink message
775  * @maxtype: maximum attribute type to be expected
791  * nlmsg_parse_deprecated - parse attributes of a netlink message
795  * @maxtype: maximum attribute type to be expected
811  * nlmsg_parse_deprecated_strict - parse attributes of a netlink message
815  * @maxtype: maximum attribute type to be expected
832  * nlmsg_find_attr - find a specific attribute in a netlink message
835  * @attrtype: type of attribute to look for
837  * Returns: the first attribute which matches the specified type.
847  * nla_validate_deprecated - Validate a stream of attributes
848  * @head: head of attribute stream
849  * @len: length of attribute stream
850  * @maxtype: maximum attribute type to be expected
854  * Validates all attributes in the specified attribute stream against the
870  * nla_validate - Validate a stream of attributes
871  * @head: head of attribute stream
872  * @len: length of attribute stream
873  * @maxtype: maximum attribute type to be expected
877  * Validates all attributes in the specified attribute stream against the
892  * nlmsg_validate_deprecated - validate a netlink message including attributes
895  * @maxtype: maximum attribute type to be expected
904 	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))  in nlmsg_validate_deprecated()
905 		return -EINVAL;  in nlmsg_validate_deprecated()
915  * nlmsg_report - need to report back to application?
922 	return nlh ? !!(nlh->nlmsg_flags & NLM_F_ECHO) : 0;  in nlmsg_report()
926  * nlmsg_seq - return the seq number of netlink message
933 	return nlh ? nlh->nlmsg_seq : 0;  in nlmsg_seq()
937  * nlmsg_for_each_attr - iterate over a stream of attributes
938  * @pos: loop counter, set to current attribute
948  * nlmsg_put - Add a new netlink message to an skb
969  * nlmsg_append - Add more data to a nlmsg in a skb
974  * with multiple fixed-format headers (which is rare).
983 	if (NLMSG_ALIGN(size) - size)  in nlmsg_append()
985 		       NLMSG_ALIGN(size) - size);  in nlmsg_append()
990  * nlmsg_put_answer - Add a new callback based netlink message to an skb
1005 	return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,  in nlmsg_put_answer()
1010  * nlmsg_new - Allocate a new netlink message
1023  * nlmsg_new_large - Allocate a new netlink message with non-contiguous
1027  * The allocated skb is unable to have frag page for shinfo->frags*,
1028  * as the NULL setting for skb->head in netlink_skb_destructor() will
1037  * nlmsg_end - Finalize a netlink message
1047 	nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;  in nlmsg_end()
1051  * nlmsg_get_pos - return current position in netlink message
1062  * nlmsg_trim - Trim message to a mark
1071 		WARN_ON((unsigned char *) mark < skb->data);  in nlmsg_trim()
1072 		skb_trim(skb, (unsigned char *) mark - skb->data);  in nlmsg_trim()
1077  * nlmsg_cancel - Cancel construction of a netlink message
1090  * nlmsg_free - drop a netlink message
1099  * nlmsg_consume - free a netlink message
1108  * nlmsg_multicast_filtered - multicast a netlink message with filter function
1138  * nlmsg_multicast - multicast a netlink message
1153  * nlmsg_unicast - unicast a netlink message
1170  * nlmsg_for_each_msg - iterate over a stream of messages
1171  * @pos: loop counter, set to current message
1182  * nl_dump_check_consistent - check if sequence is consistent and advertise if not
1189  * The correct way to use it is to set cb->seq to the generation counter when
1200 	if (cb->prev_seq && cb->seq != cb->prev_seq)  in nl_dump_check_consistent()
1201 		nlh->nlmsg_flags |= NLM_F_DUMP_INTR;  in nl_dump_check_consistent()
1202 	cb->prev_seq = cb->seq;  in nl_dump_check_consistent()
1210  * nla_attr_size - length of attribute not including padding
1219  * nla_total_size - total length of attribute including padding
1228  * nla_padlen - length of padding at the tail of attribute
1233 	return nla_total_size(payload) - nla_attr_size(payload);  in nla_padlen()
1237  * nla_type - attribute type
1238  * @nla: netlink attribute
1242 	return nla->nla_type & NLA_TYPE_MASK;  in nla_type()
1246  * nla_data - head of payload
1247  * @nla: netlink attribute
1255  * nla_len - length of payload
1256  * @nla: netlink attribute
1260 	return nla->nla_len - NLA_HDRLEN;  in nla_len()
1264  * nla_ok - check if the netlink attribute fits into the remaining bytes
1265  * @nla: netlink attribute
1266  * @remaining: number of bytes remaining in attribute stream
1271 	       nla->nla_len >= sizeof(*nla) &&  in nla_ok()
1272 	       nla->nla_len <= remaining;  in nla_ok()
1276  * nla_next - next netlink attribute in attribute stream
1277  * @nla: netlink attribute
1278  * @remaining: number of bytes remaining in attribute stream
1280  * Returns: the next netlink attribute in the attribute stream and
1281  * decrements remaining by the size of the current attribute.
1285 	unsigned int totlen = NLA_ALIGN(nla->nla_len);  in nla_next()
1287 	*remaining -= totlen;  in nla_next()
1292  * nla_find_nested - find attribute in a set of nested attributes
1293  * @nla: attribute containing the nested attributes
1294  * @attrtype: type of attribute to look for
1296  * Returns: the first attribute which matches the specified type.
1305  * nla_parse_nested - parse nested attributes
1307  * @maxtype: maximum attribute type to be expected
1308  * @nla: attribute containing the nested attributes
1319 	if (!(nla->nla_type & NLA_F_NESTED)) {  in nla_parse_nested()
1321 		return -EINVAL;  in nla_parse_nested()
1329  * nla_parse_nested_deprecated - parse nested attributes
1331  * @maxtype: maximum attribute type to be expected
1332  * @nla: attribute containing the nested attributes
1348  * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
1349  * @skb: socket buffer to add attribute to
1350  * @attrtype: attribute type
1355 	/* temporary variables to work around GCC PR81715 with asan-stack=1 */  in nla_put_u8()
1362  * nla_put_u16 - Add a u16 netlink attribute to a socket buffer
1363  * @skb: socket buffer to add attribute to
1364  * @attrtype: attribute type
1375  * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
1376  * @skb: socket buffer to add attribute to
1377  * @attrtype: attribute type
1388  * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
1389  * @skb: socket buffer to add attribute to
1390  * @attrtype: attribute type
1401  * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
1402  * @skb: socket buffer to add attribute to
1403  * @attrtype: attribute type
1414  * nla_put_u32 - Add a u32 netlink attribute to a socket buffer
1415  * @skb: socket buffer to add attribute to
1416  * @attrtype: attribute type
1427  * nla_put_uint - Add a variable-size unsigned int to a socket buffer
1428  * @skb: socket buffer to add attribute to
1429  * @attrtype: attribute type
1443  * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer
1444  * @skb: socket buffer to add attribute to
1445  * @attrtype: attribute type
1456  * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer
1457  * @skb: socket buffer to add attribute to
1458  * @attrtype: attribute type
1469  * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer
1470  * @skb: socket buffer to add attribute to
1471  * @attrtype: attribute type
1482  * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it
1483  * @skb: socket buffer to add attribute to
1484  * @attrtype: attribute type
1486  * @padattr: attribute type for the padding
1497  * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it
1498  * @skb: socket buffer to add attribute to
1499  * @attrtype: attribute type
1501  * @padattr: attribute type for the padding
1512  * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it
1513  * @skb: socket buffer to add attribute to
1514  * @attrtype: attribute type
1516  * @padattr: attribute type for the padding
1528  * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it
1529  * @skb: socket buffer to add attribute to
1530  * @attrtype: attribute type
1532  * @padattr: attribute type for the padding
1543  * nla_put_s8 - Add a s8 netlink attribute to a socket buffer
1544  * @skb: socket buffer to add attribute to
1545  * @attrtype: attribute type
1556  * nla_put_s16 - Add a s16 netlink attribute to a socket buffer
1557  * @skb: socket buffer to add attribute to
1558  * @attrtype: attribute type
1569  * nla_put_s32 - Add a s32 netlink attribute to a socket buffer
1570  * @skb: socket buffer to add attribute to
1571  * @attrtype: attribute type
1582  * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it
1583  * @skb: socket buffer to add attribute to
1584  * @attrtype: attribute type
1586  * @padattr: attribute type for the padding
1597  * nla_put_sint - Add a variable-size signed int to a socket buffer
1598  * @skb: socket buffer to add attribute to
1599  * @attrtype: attribute type
1613  * nla_put_string - Add a string netlink attribute to a socket buffer
1614  * @skb: socket buffer to add attribute to
1615  * @attrtype: attribute type
1625  * nla_put_flag - Add a flag netlink attribute to a socket buffer
1626  * @skb: socket buffer to add attribute to
1627  * @attrtype: attribute type
1635  * nla_put_msecs - Add a msecs netlink attribute to a skb and align it
1636  * @skb: socket buffer to add attribute to
1637  * @attrtype: attribute type
1639  * @padattr: attribute type for the padding
1650  * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket
1652  * @skb: socket buffer to add attribute to
1653  * @attrtype: attribute type
1665  * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket
1667  * @skb: socket buffer to add attribute to
1668  * @attrtype: attribute type
1678  * nla_put_bitfield32 - Add a bitfield32 netlink attribute to a socket buffer
1679  * @skb: socket buffer to add attribute to
1680  * @attrtype: attribute type
1693  * nla_get_u32 - return payload of u32 attribute
1694  * @nla: u32 netlink attribute
1702  * nla_get_u32_default - return payload of u32 attribute or default
1703  * @nla: u32 netlink attribute, may be %NULL
1706  * Return: the value of the attribute, or the default value if not present
1716  * nla_get_be32 - return payload of __be32 attribute
1717  * @nla: __be32 netlink attribute
1725  * nla_get_be32_default - return payload of be32 attribute or default
1726  * @nla: __be32 netlink attribute, may be %NULL
1729  * Return: the value of the attribute, or the default value if not present
1740  * nla_get_le32 - return payload of __le32 attribute
1741  * @nla: __le32 netlink attribute
1749  * nla_get_le32_default - return payload of le32 attribute or default
1750  * @nla: __le32 netlink attribute, may be %NULL
1753  * Return: the value of the attribute, or the default value if not present
1764  * nla_get_u16 - return payload of u16 attribute
1765  * @nla: u16 netlink attribute
1773  * nla_get_u16_default - return payload of u16 attribute or default
1774  * @nla: u16 netlink attribute, may be %NULL
1777  * Return: the value of the attribute, or the default value if not present
1787  * nla_get_be16 - return payload of __be16 attribute
1788  * @nla: __be16 netlink attribute
1796  * nla_get_be16_default - return payload of be16 attribute or default
1797  * @nla: __be16 netlink attribute, may be %NULL
1800  * Return: the value of the attribute, or the default value if not present
1811  * nla_get_le16 - return payload of __le16 attribute
1812  * @nla: __le16 netlink attribute
1820  * nla_get_le16_default - return payload of le16 attribute or default
1821  * @nla: __le16 netlink attribute, may be %NULL
1824  * Return: the value of the attribute, or the default value if not present
1835  * nla_get_u8 - return payload of u8 attribute
1836  * @nla: u8 netlink attribute
1844  * nla_get_u8_default - return payload of u8 attribute or default
1845  * @nla: u8 netlink attribute, may be %NULL
1848  * Return: the value of the attribute, or the default value if not present
1858  * nla_get_u64 - return payload of u64 attribute
1859  * @nla: u64 netlink attribute
1871  * nla_get_u64_default - return payload of u64 attribute or default
1872  * @nla: u64 netlink attribute, may be %NULL
1875  * Return: the value of the attribute, or the default value if not present
1885  * nla_get_uint - return payload of uint attribute
1886  * @nla: uint netlink attribute
1896  * nla_get_uint_default - return payload of uint attribute or default
1897  * @nla: uint netlink attribute, may be %NULL
1900  * Return: the value of the attribute, or the default value if not present
1910  * nla_get_be64 - return payload of __be64 attribute
1911  * @nla: __be64 netlink attribute
1923  * nla_get_be64_default - return payload of be64 attribute or default
1924  * @nla: __be64 netlink attribute, may be %NULL
1927  * Return: the value of the attribute, or the default value if not present
1938  * nla_get_le64 - return payload of __le64 attribute
1939  * @nla: __le64 netlink attribute
1947  * nla_get_le64_default - return payload of le64 attribute or default
1948  * @nla: __le64 netlink attribute, may be %NULL
1951  * Return: the value of the attribute, or the default value if not present
1962  * nla_get_s32 - return payload of s32 attribute
1963  * @nla: s32 netlink attribute
1971  * nla_get_s32_default - return payload of s32 attribute or default
1972  * @nla: s32 netlink attribute, may be %NULL
1975  * Return: the value of the attribute, or the default value if not present
1985  * nla_get_s16 - return payload of s16 attribute
1986  * @nla: s16 netlink attribute
1994  * nla_get_s16_default - return payload of s16 attribute or default
1995  * @nla: s16 netlink attribute, may be %NULL
1998  * Return: the value of the attribute, or the default value if not present
2008  * nla_get_s8 - return payload of s8 attribute
2009  * @nla: s8 netlink attribute
2017  * nla_get_s8_default - return payload of s8 attribute or default
2018  * @nla: s8 netlink attribute, may be %NULL
2021  * Return: the value of the attribute, or the default value if not present
2031  * nla_get_s64 - return payload of s64 attribute
2032  * @nla: s64 netlink attribute
2044  * nla_get_s64_default - return payload of s64 attribute or default
2045  * @nla: s64 netlink attribute, may be %NULL
2048  * Return: the value of the attribute, or the default value if not present
2058  * nla_get_sint - return payload of uint attribute
2059  * @nla: uint netlink attribute
2069  * nla_get_sint_default - return payload of sint attribute or default
2070  * @nla: sint netlink attribute, may be %NULL
2073  * Return: the value of the attribute, or the default value if not present
2083  * nla_get_flag - return payload of flag attribute
2084  * @nla: flag netlink attribute
2092  * nla_get_msecs - return payload of msecs attribute
2093  * @nla: msecs netlink attribute
2105  * nla_get_msecs_default - return payload of msecs attribute or default
2106  * @nla: msecs netlink attribute, may be %NULL
2109  * Return: the value of the attribute, or the default value if not present
2120  * nla_get_in_addr - return payload of IPv4 address attribute
2121  * @nla: IPv4 address netlink attribute
2129  * nla_get_in_addr_default - return payload of be32 attribute or default
2130  * @nla: IPv4 address netlink attribute, may be %NULL
2133  * Return: the value of the attribute, or the default value if not present
2144  * nla_get_in6_addr - return payload of IPv6 address attribute
2145  * @nla: IPv6 address netlink attribute
2156  * nla_get_bitfield32 - return payload of 32 bitfield attribute
2157  * @nla: nla_bitfield32 attribute
2168  * nla_memdup - duplicate attribute memory (kmemdup)
2169  * @src: netlink attribute to duplicate from
2179  * nla_nest_start_noflag - Start a new level of nested attributes
2181  * @attrtype: attribute type of container
2187  * Returns: the container attribute or NULL on error
2201  * nla_nest_start - Start a new level of nested attributes, with NLA_F_NESTED
2203  * @attrtype: attribute type of container
2205  * Unlike nla_nest_start_noflag(), mark the nest attribute with NLA_F_NESTED
2208  * Returns: the container attribute or NULL on error
2216  * nla_nest_end - Finalize nesting of attributes
2218  * @start: container attribute
2220  * Corrects the container attribute header to include the all
2227 	start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;  in nla_nest_end()
2228 	return skb->len;  in nla_nest_end()
2232  * nla_nest_cancel - Cancel nesting of attributes
2234  * @start: container attribute
2236  * Removes the container attribute and including all nested
2237  * attributes. Returns -EMSGSIZE
2245  * nla_put_empty_nest - Create an empty nest
2247  * @attrtype: attribute type of the container
2251  * Returns: 0 when successful or -EMSGSIZE on failure.
2255 	return nla_nest_start(skb, attrtype) ? 0 : -EMSGSIZE;  in nla_put_empty_nest()
2259  * __nla_validate_nested - Validate a stream of nested attributes
2260  * @start: container attribute
2261  * @maxtype: maximum attribute type to be expected
2266  * Validates all attributes in the nested attribute stream against the
2300  * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute
2303  * Return: true if padding is needed to align the next attribute (nla_data()) to
2304  * a 64-bit aligned area.
2310 	 * if the skb->data _is_ aligned.  A NOP attribute, plus  in nla_need_padding_for_64bit()
2311 	 * nlattr header for next attribute, will make nla_data()  in nla_need_padding_for_64bit()
2312 	 * 8-byte aligned.  in nla_need_padding_for_64bit()
2321  * nla_align_64bit - 64-bit align the nla_data() of next attribute
2323  * @padattr: attribute type for the padding
2325  * Conditionally emit a padding netlink attribute in order to make
2326  * the next attribute we emit have a 64-bit aligned nla_data() area.
2336 		return -EMSGSIZE;  in nla_align_64bit()
2342  * nla_total_size_64bit - total length of attribute including padding
2355  * nla_for_each_attr - iterate over a stream of attributes
2356  * @pos: loop counter, set to current attribute
2357  * @head: head of attribute stream
2358  * @len: length of attribute stream
2367  * nla_for_each_attr_type - iterate over a stream of attributes
2368  * @pos: loop counter, set to current attribute
2369  * @type: required attribute type for @pos
2370  * @head: head of attribute stream
2371  * @len: length of attribute stream
2379  * nla_for_each_nested - iterate over nested attributes
2380  * @pos: loop counter, set to current attribute
2381  * @nla: attribute containing the nested attributes
2388  * nla_for_each_nested_type - iterate over nested attributes
2389  * @pos: loop counter, set to current attribute
2390  * @type: required attribute type for @pos
2391  * @nla: attribute containing the nested attributes
2399  * nla_is_last - Test if attribute is last in stream
2400  * @nla: attribute to test
2405 	return nla->nla_len == rem;  in nla_is_last()