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
122  * Attribute Length Calculations:
123  *   nla_attr_size(payload)		length of attribute w/o padding
124  *   nla_total_size(payload)		length of attribute w/ padding
127  * Attribute Payload Access:
128  *   nla_data(nla)			head of attribute payload
129  *   nla_len(nla)			length of attribute payload
131  * Attribute Payload Access for Basic Types:
132  *   nla_get_uint(nla)			get payload for a uint attribute
133  *   nla_get_sint(nla)			get payload for a sint attribute
134  *   nla_get_u8(nla)			get payload for a u8 attribute
135  *   nla_get_u16(nla)			get payload for a u16 attribute
136  *   nla_get_u32(nla)			get payload for a u32 attribute
137  *   nla_get_u64(nla)			get payload for a u64 attribute
138  *   nla_get_s8(nla)			get payload for a s8 attribute
139  *   nla_get_s16(nla)			get payload for a s16 attribute
140  *   nla_get_s32(nla)			get payload for a s32 attribute
141  *   nla_get_s64(nla)			get payload for a s64 attribute
143  *   nla_get_msecs(nla)			get payload for a msecs attribute
147  * Attribute Misc:
148  *   nla_memcpy(dest, nla, count)	copy attribute into memory
149  *   nla_memcmp(nla, data, size)	compare attribute with memory area
150  *   nla_strscpy(dst, nla, size)	copy attribute to a sized string
151  *   nla_strcmp(nla, str)		compare attribute with string
153  * Attribute Parsing:
155  *   nla_next(nla, remaining)		get next netlink attribute
158  *   nla_find()				find attribute in stream of attributes
159  *   nla_find_nested()			find attribute in nested attributes
172   * Standard attribute types to specify validation policy
200 #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
222  * struct nla_policy - attribute validation policy
223  * @type: Type of attribute or NLA_UNSPEC
224  * @validation_type: type of attribute validation done in addition to
225  *	type-specific validation (e.g. range, function call), see
230  * accessible by attribute type up to the highest identifier to be expected.
236  *    NLA_BINARY           Maximum length of attribute payload
254  *    All other            Minimum length of attribute payload
257  *    NLA_BITFIELD32       This is a 32-bit bitmap/bitselector attribute and
259  *    NLA_REJECT           This attribute is always rejected and `reject_message'
263  *                         also set `len' to the max attribute number. Use the
266  *                         parse, the nested sub-policies.
268  *                         must also set `len' to the max attribute number. Use
273  *                         level down and the attribute types directly in the
289  *                         the value of the integer attribute.
293  *                         of s16 - do that using the NLA_POLICY_FULL_RANGE()
301  *    NLA_U64              If the validation_type field instead is set to
310  *    NLA_S64              If the validation_type field instead is set to
318  *                         integers) of the attribute is enforced.
320  *    All other            Unused - but note that it's a union
323  *    NLA_BINARY           Validation function called for the attribute.
324  *    All other            Unused - but note that it's a union
343 		 * @strict_start_type: first attribute to validate strictly
345 		 * This entry is special, and used for the attribute at index 0
348 		 * starts for any attribute types >= this value, also, strict
357 		 * For completely new families it should be set to 1 so that the
359 		 * it should be set at least when new attributes are added to
360 		 * the enum used by the policy, and be set to the new value that
365 		/* private: use NLA_POLICY_*() to set */
388 	_NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy)
390 	_NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy)
477  * struct nl_info - netlink source information
482  * @skip_notify_kernel: Skip selected in-kernel notifications
493  * enum netlink_validation - netlink message/attribute validation levels
494  * @NL_VALIDATE_LIBERAL: Old-style "be liberal" validation, not caring about
497  * @NL_VALIDATE_TRAILING: Reject junk data encountered after attribute parsing.
501  *	This can safely be set by the kernel when the given policy has no
504  * @NL_VALIDATE_STRICT_ATTRS: strict attribute policy parsing (e.g.
506  * @NL_VALIDATE_NESTED: Check that NLA_F_NESTED is set for NLA_NESTED(_ARRAY)
569  * nlmsg_msg_size - length of netlink message not including padding
578  * nlmsg_total_size - length of netlink message including padding
587  * nlmsg_padlen - length of padding at the message's tail
592 	return nlmsg_total_size(payload) - nlmsg_msg_size(payload);  in nlmsg_padlen()
596  * nlmsg_data - head of message payload
605  * nlmsg_len - length of message payload
610 	return nlh->nlmsg_len - NLMSG_HDRLEN;  in nlmsg_len()
614  * nlmsg_attrdata - head of attributes data
626  * nlmsg_attrlen - length of attributes data
632 	return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen);  in nlmsg_attrlen()
636  * nlmsg_ok - check if the netlink message fits into the remaining bytes
643 		nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&  in nlmsg_ok()
644 		nlh->nlmsg_len <= remaining);  in nlmsg_ok()
648  * nlmsg_next - next netlink message in message stream
658 	int totlen = NLMSG_ALIGN(nlh->nlmsg_len);  in nlmsg_next()
660 	*remaining -= totlen;  in nlmsg_next()
666  * nla_parse - Parse a stream of attributes into a tb buffer
668  * @maxtype: maximum attribute type to be expected
669  * @head: head of attribute stream
670  * @len: length of attribute stream
674  * Parses a stream of attributes and stores a pointer to each attribute in
675  * the tb array accessible via the attribute type. Attributes with a type
691  * nla_parse_deprecated - Parse a stream of attributes into a tb buffer
693  * @maxtype: maximum attribute type to be expected
694  * @head: head of attribute stream
695  * @len: length of attribute stream
699  * Parses a stream of attributes and stores a pointer to each attribute in
700  * the tb array accessible via the attribute type. Attributes with a type
716  * nla_parse_deprecated_strict - Parse a stream of attributes into a tb buffer
718  * @maxtype: maximum attribute type to be expected
719  * @head: head of attribute stream
720  * @len: length of attribute stream
724  * Parses a stream of attributes and stores a pointer to each attribute in
725  * the tb array accessible via the attribute type. Attributes with a type
742  * __nlmsg_parse - parse attributes of a netlink message
746  * @maxtype: maximum attribute type to be expected
759 	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) {  in __nlmsg_parse()
761 		return -EINVAL;  in __nlmsg_parse()
770  * nlmsg_parse - parse attributes of a netlink message
774  * @maxtype: maximum attribute type to be expected
790  * nlmsg_parse_deprecated - parse attributes of a netlink message
794  * @maxtype: maximum attribute type to be expected
810  * nlmsg_parse_deprecated_strict - parse attributes of a netlink message
814  * @maxtype: maximum attribute type to be expected
831  * nlmsg_find_attr - find a specific attribute in a netlink message
834  * @attrtype: type of attribute to look for
836  * Returns: the first attribute which matches the specified type.
846  * nla_validate_deprecated - Validate a stream of attributes
847  * @head: head of attribute stream
848  * @len: length of attribute stream
849  * @maxtype: maximum attribute type to be expected
853  * Validates all attributes in the specified attribute stream against the
869  * nla_validate - Validate a stream of attributes
870  * @head: head of attribute stream
871  * @len: length of attribute stream
872  * @maxtype: maximum attribute type to be expected
876  * Validates all attributes in the specified attribute stream against the
891  * nlmsg_validate_deprecated - validate a netlink message including attributes
894  * @maxtype: maximum attribute type to be expected
903 	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))  in nlmsg_validate_deprecated()
904 		return -EINVAL;  in nlmsg_validate_deprecated()
914  * nlmsg_report - need to report back to application?
921 	return nlh ? !!(nlh->nlmsg_flags & NLM_F_ECHO) : 0;  in nlmsg_report()
925  * nlmsg_seq - return the seq number of netlink message
932 	return nlh ? nlh->nlmsg_seq : 0;  in nlmsg_seq()
936  * nlmsg_for_each_attr - iterate over a stream of attributes
937  * @pos: loop counter, set to current attribute
947  * nlmsg_put - Add a new netlink message to an skb
968  * nlmsg_append - Add more data to a nlmsg in a skb
973  * with multiple fixed-format headers (which is rare).
982 	if (NLMSG_ALIGN(size) - size)  in nlmsg_append()
984 		       NLMSG_ALIGN(size) - size);  in nlmsg_append()
989  * nlmsg_put_answer - Add a new callback based netlink message to an skb
1004 	return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,  in nlmsg_put_answer()
1009  * nlmsg_new - Allocate a new netlink message
1022  * nlmsg_new_large - Allocate a new netlink message with non-contiguous
1026  * The allocated skb is unable to have frag page for shinfo->frags*,
1027  * as the NULL setting for skb->head in netlink_skb_destructor() will
1036  * nlmsg_end - Finalize a netlink message
1046 	nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;  in nlmsg_end()
1050  * nlmsg_get_pos - return current position in netlink message
1061  * nlmsg_trim - Trim message to a mark
1070 		WARN_ON((unsigned char *) mark < skb->data);  in nlmsg_trim()
1071 		skb_trim(skb, (unsigned char *) mark - skb->data);  in nlmsg_trim()
1076  * nlmsg_cancel - Cancel construction of a netlink message
1089  * nlmsg_free - drop a netlink message
1098  * nlmsg_consume - free a netlink message
1107  * nlmsg_multicast_filtered - multicast a netlink message with filter function
1137  * nlmsg_multicast - multicast a netlink message
1152  * nlmsg_unicast - unicast a netlink message
1169  * nlmsg_for_each_msg - iterate over a stream of messages
1170  * @pos: loop counter, set to current message
1181  * nl_dump_check_consistent - check if sequence is consistent and advertise if not
1188  * The correct way to use it is to set cb->seq to the generation counter when
1199 	if (cb->prev_seq && cb->seq != cb->prev_seq)  in nl_dump_check_consistent()
1200 		nlh->nlmsg_flags |= NLM_F_DUMP_INTR;  in nl_dump_check_consistent()
1201 	cb->prev_seq = cb->seq;  in nl_dump_check_consistent()
1209  * nla_attr_size - length of attribute not including padding
1218  * nla_total_size - total length of attribute including padding
1227  * nla_padlen - length of padding at the tail of attribute
1232 	return nla_total_size(payload) - nla_attr_size(payload);  in nla_padlen()
1236  * nla_type - attribute type
1237  * @nla: netlink attribute
1241 	return nla->nla_type & NLA_TYPE_MASK;  in nla_type()
1245  * nla_data - head of payload
1246  * @nla: netlink attribute
1254  * nla_len - length of payload
1255  * @nla: netlink attribute
1259 	return nla->nla_len - NLA_HDRLEN;  in nla_len()
1263  * nla_ok - check if the netlink attribute fits into the remaining bytes
1264  * @nla: netlink attribute
1265  * @remaining: number of bytes remaining in attribute stream
1270 	       nla->nla_len >= sizeof(*nla) &&  in nla_ok()
1271 	       nla->nla_len <= remaining;  in nla_ok()
1275  * nla_next - next netlink attribute in attribute stream
1276  * @nla: netlink attribute
1277  * @remaining: number of bytes remaining in attribute stream
1279  * Returns: the next netlink attribute in the attribute stream and
1280  * decrements remaining by the size of the current attribute.
1284 	unsigned int totlen = NLA_ALIGN(nla->nla_len);  in nla_next()
1286 	*remaining -= totlen;  in nla_next()
1291  * nla_find_nested - find attribute in a set of nested attributes
1292  * @nla: attribute containing the nested attributes
1293  * @attrtype: type of attribute to look for
1295  * Returns: the first attribute which matches the specified type.
1304  * nla_parse_nested - parse nested attributes
1306  * @maxtype: maximum attribute type to be expected
1307  * @nla: attribute containing the nested attributes
1318 	if (!(nla->nla_type & NLA_F_NESTED)) {  in nla_parse_nested()
1320 		return -EINVAL;  in nla_parse_nested()
1328  * nla_parse_nested_deprecated - parse nested attributes
1330  * @maxtype: maximum attribute type to be expected
1331  * @nla: attribute containing the nested attributes
1347  * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
1348  * @skb: socket buffer to add attribute to
1349  * @attrtype: attribute type
1354 	/* temporary variables to work around GCC PR81715 with asan-stack=1 */  in nla_put_u8()
1361  * nla_put_u16 - Add a u16 netlink attribute to a socket buffer
1362  * @skb: socket buffer to add attribute to
1363  * @attrtype: attribute type
1374  * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
1375  * @skb: socket buffer to add attribute to
1376  * @attrtype: attribute type
1387  * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
1388  * @skb: socket buffer to add attribute to
1389  * @attrtype: attribute type
1400  * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
1401  * @skb: socket buffer to add attribute to
1402  * @attrtype: attribute type
1413  * nla_put_u32 - Add a u32 netlink attribute to a socket buffer
1414  * @skb: socket buffer to add attribute to
1415  * @attrtype: attribute type
1426  * nla_put_uint - Add a variable-size unsigned int to a socket buffer
1427  * @skb: socket buffer to add attribute to
1428  * @attrtype: attribute type
1442  * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer
1443  * @skb: socket buffer to add attribute to
1444  * @attrtype: attribute type
1455  * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer
1456  * @skb: socket buffer to add attribute to
1457  * @attrtype: attribute type
1468  * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer
1469  * @skb: socket buffer to add attribute to
1470  * @attrtype: attribute type
1481  * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it
1482  * @skb: socket buffer to add attribute to
1483  * @attrtype: attribute type
1485  * @padattr: attribute type for the padding
1496  * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it
1497  * @skb: socket buffer to add attribute to
1498  * @attrtype: attribute type
1500  * @padattr: attribute type for the padding
1511  * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it
1512  * @skb: socket buffer to add attribute to
1513  * @attrtype: attribute type
1515  * @padattr: attribute type for the padding
1527  * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it
1528  * @skb: socket buffer to add attribute to
1529  * @attrtype: attribute type
1531  * @padattr: attribute type for the padding
1542  * nla_put_s8 - Add a s8 netlink attribute to a socket buffer
1543  * @skb: socket buffer to add attribute to
1544  * @attrtype: attribute type
1555  * nla_put_s16 - Add a s16 netlink attribute to a socket buffer
1556  * @skb: socket buffer to add attribute to
1557  * @attrtype: attribute type
1568  * nla_put_s32 - Add a s32 netlink attribute to a socket buffer
1569  * @skb: socket buffer to add attribute to
1570  * @attrtype: attribute type
1581  * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it
1582  * @skb: socket buffer to add attribute to
1583  * @attrtype: attribute type
1585  * @padattr: attribute type for the padding
1596  * nla_put_sint - Add a variable-size signed int to a socket buffer
1597  * @skb: socket buffer to add attribute to
1598  * @attrtype: attribute type
1612  * nla_put_string - Add a string netlink attribute to a socket buffer
1613  * @skb: socket buffer to add attribute to
1614  * @attrtype: attribute type
1624  * nla_put_flag - Add a flag netlink attribute to a socket buffer
1625  * @skb: socket buffer to add attribute to
1626  * @attrtype: attribute type
1634  * nla_put_msecs - Add a msecs netlink attribute to a skb and align it
1635  * @skb: socket buffer to add attribute to
1636  * @attrtype: attribute type
1638  * @padattr: attribute type for the padding
1649  * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket
1651  * @skb: socket buffer to add attribute to
1652  * @attrtype: attribute type
1664  * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket
1666  * @skb: socket buffer to add attribute to
1667  * @attrtype: attribute type
1677  * nla_put_bitfield32 - Add a bitfield32 netlink attribute to a socket buffer
1678  * @skb: socket buffer to add attribute to
1679  * @attrtype: attribute type
1692  * nla_get_u32 - return payload of u32 attribute
1693  * @nla: u32 netlink attribute
1701  * nla_get_u32_default - return payload of u32 attribute or default
1702  * @nla: u32 netlink attribute, may be %NULL
1705  * Return: the value of the attribute, or the default value if not present
1715  * nla_get_be32 - return payload of __be32 attribute
1716  * @nla: __be32 netlink attribute
1724  * nla_get_be32_default - return payload of be32 attribute or default
1725  * @nla: __be32 netlink attribute, may be %NULL
1728  * Return: the value of the attribute, or the default value if not present
1739  * nla_get_le32 - return payload of __le32 attribute
1740  * @nla: __le32 netlink attribute
1748  * nla_get_le32_default - return payload of le32 attribute or default
1749  * @nla: __le32 netlink attribute, may be %NULL
1752  * Return: the value of the attribute, or the default value if not present
1763  * nla_get_u16 - return payload of u16 attribute
1764  * @nla: u16 netlink attribute
1772  * nla_get_u16_default - return payload of u16 attribute or default
1773  * @nla: u16 netlink attribute, may be %NULL
1776  * Return: the value of the attribute, or the default value if not present
1786  * nla_get_be16 - return payload of __be16 attribute
1787  * @nla: __be16 netlink attribute
1795  * nla_get_be16_default - return payload of be16 attribute or default
1796  * @nla: __be16 netlink attribute, may be %NULL
1799  * Return: the value of the attribute, or the default value if not present
1810  * nla_get_le16 - return payload of __le16 attribute
1811  * @nla: __le16 netlink attribute
1819  * nla_get_le16_default - return payload of le16 attribute or default
1820  * @nla: __le16 netlink attribute, may be %NULL
1823  * Return: the value of the attribute, or the default value if not present
1834  * nla_get_u8 - return payload of u8 attribute
1835  * @nla: u8 netlink attribute
1843  * nla_get_u8_default - return payload of u8 attribute or default
1844  * @nla: u8 netlink attribute, may be %NULL
1847  * Return: the value of the attribute, or the default value if not present
1857  * nla_get_u64 - return payload of u64 attribute
1858  * @nla: u64 netlink attribute
1870  * nla_get_u64_default - return payload of u64 attribute or default
1871  * @nla: u64 netlink attribute, may be %NULL
1874  * Return: the value of the attribute, or the default value if not present
1884  * nla_get_uint - return payload of uint attribute
1885  * @nla: uint netlink attribute
1895  * nla_get_uint_default - return payload of uint attribute or default
1896  * @nla: uint netlink attribute, may be %NULL
1899  * Return: the value of the attribute, or the default value if not present
1909  * nla_get_be64 - return payload of __be64 attribute
1910  * @nla: __be64 netlink attribute
1922  * nla_get_be64_default - return payload of be64 attribute or default
1923  * @nla: __be64 netlink attribute, may be %NULL
1926  * Return: the value of the attribute, or the default value if not present
1937  * nla_get_le64 - return payload of __le64 attribute
1938  * @nla: __le64 netlink attribute
1946  * nla_get_le64_default - return payload of le64 attribute or default
1947  * @nla: __le64 netlink attribute, may be %NULL
1950  * Return: the value of the attribute, or the default value if not present
1961  * nla_get_s32 - return payload of s32 attribute
1962  * @nla: s32 netlink attribute
1970  * nla_get_s32_default - return payload of s32 attribute or default
1971  * @nla: s32 netlink attribute, may be %NULL
1974  * Return: the value of the attribute, or the default value if not present
1984  * nla_get_s16 - return payload of s16 attribute
1985  * @nla: s16 netlink attribute
1993  * nla_get_s16_default - return payload of s16 attribute or default
1994  * @nla: s16 netlink attribute, may be %NULL
1997  * Return: the value of the attribute, or the default value if not present
2007  * nla_get_s8 - return payload of s8 attribute
2008  * @nla: s8 netlink attribute
2016  * nla_get_s8_default - return payload of s8 attribute or default
2017  * @nla: s8 netlink attribute, may be %NULL
2020  * Return: the value of the attribute, or the default value if not present
2030  * nla_get_s64 - return payload of s64 attribute
2031  * @nla: s64 netlink attribute
2043  * nla_get_s64_default - return payload of s64 attribute or default
2044  * @nla: s64 netlink attribute, may be %NULL
2047  * Return: the value of the attribute, or the default value if not present
2057  * nla_get_sint - return payload of uint attribute
2058  * @nla: uint netlink attribute
2068  * nla_get_sint_default - return payload of sint attribute or default
2069  * @nla: sint netlink attribute, may be %NULL
2072  * Return: the value of the attribute, or the default value if not present
2082  * nla_get_flag - return payload of flag attribute
2083  * @nla: flag netlink attribute
2091  * nla_get_msecs - return payload of msecs attribute
2092  * @nla: msecs netlink attribute
2104  * nla_get_msecs_default - return payload of msecs attribute or default
2105  * @nla: msecs netlink attribute, may be %NULL
2108  * Return: the value of the attribute, or the default value if not present
2119  * nla_get_in_addr - return payload of IPv4 address attribute
2120  * @nla: IPv4 address netlink attribute
2128  * nla_get_in_addr_default - return payload of be32 attribute or default
2129  * @nla: IPv4 address netlink attribute, may be %NULL
2132  * Return: the value of the attribute, or the default value if not present
2143  * nla_get_in6_addr - return payload of IPv6 address attribute
2144  * @nla: IPv6 address netlink attribute
2155  * nla_get_bitfield32 - return payload of 32 bitfield attribute
2156  * @nla: nla_bitfield32 attribute
2167  * nla_memdup - duplicate attribute memory (kmemdup)
2168  * @src: netlink attribute to duplicate from
2178  * nla_nest_start_noflag - Start a new level of nested attributes
2180  * @attrtype: attribute type of container
2186  * Returns: the container attribute or NULL on error
2200  * nla_nest_start - Start a new level of nested attributes, with NLA_F_NESTED
2202  * @attrtype: attribute type of container
2204  * Unlike nla_nest_start_noflag(), mark the nest attribute with NLA_F_NESTED
2207  * Returns: the container attribute or NULL on error
2215  * nla_nest_end - Finalize nesting of attributes
2217  * @start: container attribute
2219  * Corrects the container attribute header to include the all
2226 	start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;  in nla_nest_end()
2227 	return skb->len;  in nla_nest_end()
2231  * nla_nest_cancel - Cancel nesting of attributes
2233  * @start: container attribute
2235  * Removes the container attribute and including all nested
2236  * attributes. Returns -EMSGSIZE
2244  * __nla_validate_nested - Validate a stream of nested attributes
2245  * @start: container attribute
2246  * @maxtype: maximum attribute type to be expected
2251  * Validates all attributes in the nested attribute stream against the
2285  * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute
2288  * Return: true if padding is needed to align the next attribute (nla_data()) to
2289  * a 64-bit aligned area.
2295 	 * if the skb->data _is_ aligned.  A NOP attribute, plus  in nla_need_padding_for_64bit()
2296 	 * nlattr header for next attribute, will make nla_data()  in nla_need_padding_for_64bit()
2297 	 * 8-byte aligned.  in nla_need_padding_for_64bit()
2306  * nla_align_64bit - 64-bit align the nla_data() of next attribute
2308  * @padattr: attribute type for the padding
2310  * Conditionally emit a padding netlink attribute in order to make
2311  * the next attribute we emit have a 64-bit aligned nla_data() area.
2321 		return -EMSGSIZE;  in nla_align_64bit()
2327  * nla_total_size_64bit - total length of attribute including padding
2340  * nla_for_each_attr - iterate over a stream of attributes
2341  * @pos: loop counter, set to current attribute
2342  * @head: head of attribute stream
2343  * @len: length of attribute stream
2352  * nla_for_each_attr_type - iterate over a stream of attributes
2353  * @pos: loop counter, set to current attribute
2354  * @type: required attribute type for @pos
2355  * @head: head of attribute stream
2356  * @len: length of attribute stream
2364  * nla_for_each_nested - iterate over nested attributes
2365  * @pos: loop counter, set to current attribute
2366  * @nla: attribute containing the nested attributes
2373  * nla_for_each_nested_type - iterate over nested attributes
2374  * @pos: loop counter, set to current attribute
2375  * @type: required attribute type for @pos
2376  * @nla: attribute containing the nested attributes
2384  * nla_is_last - Test if attribute is last in stream
2385  * @nla: attribute to test
2390 	return nla->nla_len == rem;  in nla_is_last()