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971b4ad882
Currently it is possible for netlink kernel user to pass custom filter function to broadcast send function netlink_broadcast_filtered(). However, this is not exposed to multicast send and to generic netlink users. Extend the api and introduce a netlink helper nlmsg_multicast_filtered() and a generic netlink helper genlmsg_multicast_netns_filtered() to allow generic netlink families to specify filter function while sending multicast messages. Signed-off-by: Jiri Pirko <jiri@nvidia.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2115 lines
64 KiB
C
2115 lines
64 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_NETLINK_H
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#define __NET_NETLINK_H
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#include <linux/types.h>
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#include <linux/netlink.h>
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#include <linux/jiffies.h>
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#include <linux/in6.h>
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/* ========================================================================
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* Netlink Messages and Attributes Interface (As Seen On TV)
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* ------------------------------------------------------------------------
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* Messages Interface
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* ------------------------------------------------------------------------
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*
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* Message Format:
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* <--- nlmsg_total_size(payload) --->
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* <-- nlmsg_msg_size(payload) ->
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* +----------+- - -+-------------+- - -+-------- - -
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* | nlmsghdr | Pad | Payload | Pad | nlmsghdr
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* +----------+- - -+-------------+- - -+-------- - -
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* nlmsg_data(nlh)---^ ^
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* nlmsg_next(nlh)-----------------------+
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*
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* Payload Format:
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* <---------------------- nlmsg_len(nlh) --------------------->
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* <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) ->
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* +----------------------+- - -+--------------------------------+
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* | Family Header | Pad | Attributes |
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* +----------------------+- - -+--------------------------------+
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* nlmsg_attrdata(nlh, hdrlen)---^
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*
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* Data Structures:
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* struct nlmsghdr netlink message header
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*
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* Message Construction:
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* nlmsg_new() create a new netlink message
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* nlmsg_put() add a netlink message to an skb
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* nlmsg_put_answer() callback based nlmsg_put()
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* nlmsg_end() finalize netlink message
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* nlmsg_get_pos() return current position in message
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* nlmsg_trim() trim part of message
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* nlmsg_cancel() cancel message construction
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* nlmsg_free() free a netlink message
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*
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* Message Sending:
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* nlmsg_multicast() multicast message to several groups
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* nlmsg_unicast() unicast a message to a single socket
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* nlmsg_notify() send notification message
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*
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* Message Length Calculations:
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* nlmsg_msg_size(payload) length of message w/o padding
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* nlmsg_total_size(payload) length of message w/ padding
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* nlmsg_padlen(payload) length of padding at tail
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*
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* Message Payload Access:
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* nlmsg_data(nlh) head of message payload
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* nlmsg_len(nlh) length of message payload
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* nlmsg_attrdata(nlh, hdrlen) head of attributes data
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* nlmsg_attrlen(nlh, hdrlen) length of attributes data
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*
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* Message Parsing:
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* nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes?
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* nlmsg_next(nlh, remaining) get next netlink message
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* nlmsg_parse() parse attributes of a message
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* nlmsg_find_attr() find an attribute in a message
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* nlmsg_for_each_msg() loop over all messages
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* nlmsg_validate() validate netlink message incl. attrs
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* nlmsg_for_each_attr() loop over all attributes
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*
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* Misc:
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* nlmsg_report() report back to application?
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*
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* ------------------------------------------------------------------------
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* Attributes Interface
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* ------------------------------------------------------------------------
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*
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* Attribute Format:
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* <------- nla_total_size(payload) ------->
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* <---- nla_attr_size(payload) ----->
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* +----------+- - -+- - - - - - - - - +- - -+-------- - -
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* | Header | Pad | Payload | Pad | Header
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* +----------+- - -+- - - - - - - - - +- - -+-------- - -
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* <- nla_len(nla) -> ^
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* nla_data(nla)----^ |
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* nla_next(nla)-----------------------------'
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*
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* Data Structures:
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* struct nlattr netlink attribute header
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*
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* Attribute Construction:
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* nla_reserve(skb, type, len) reserve room for an attribute
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* nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr
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* nla_put(skb, type, len, data) add attribute to skb
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* nla_put_nohdr(skb, len, data) add attribute w/o hdr
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* nla_append(skb, len, data) append data to skb
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*
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* Attribute Construction for Basic Types:
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* nla_put_u8(skb, type, value) add u8 attribute to skb
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* nla_put_u16(skb, type, value) add u16 attribute to skb
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* nla_put_u32(skb, type, value) add u32 attribute to skb
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* nla_put_u64_64bit(skb, type,
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* value, padattr) add u64 attribute to skb
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* nla_put_s8(skb, type, value) add s8 attribute to skb
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* nla_put_s16(skb, type, value) add s16 attribute to skb
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* nla_put_s32(skb, type, value) add s32 attribute to skb
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* nla_put_s64(skb, type, value,
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* padattr) add s64 attribute to skb
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* nla_put_string(skb, type, str) add string attribute to skb
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* nla_put_flag(skb, type) add flag attribute to skb
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* nla_put_msecs(skb, type, jiffies,
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* padattr) add msecs attribute to skb
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* nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb
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* nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb
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*
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* Nested Attributes Construction:
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* nla_nest_start(skb, type) start a nested attribute
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* nla_nest_end(skb, nla) finalize a nested attribute
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* nla_nest_cancel(skb, nla) cancel nested attribute construction
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*
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* Attribute Length Calculations:
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* nla_attr_size(payload) length of attribute w/o padding
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* nla_total_size(payload) length of attribute w/ padding
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* nla_padlen(payload) length of padding
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*
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* Attribute Payload Access:
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* nla_data(nla) head of attribute payload
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* nla_len(nla) length of attribute payload
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*
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* Attribute Payload Access for Basic Types:
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* nla_get_uint(nla) get payload for a uint attribute
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* nla_get_sint(nla) get payload for a sint attribute
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* nla_get_u8(nla) get payload for a u8 attribute
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* nla_get_u16(nla) get payload for a u16 attribute
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* nla_get_u32(nla) get payload for a u32 attribute
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* nla_get_u64(nla) get payload for a u64 attribute
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* nla_get_s8(nla) get payload for a s8 attribute
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* nla_get_s16(nla) get payload for a s16 attribute
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* nla_get_s32(nla) get payload for a s32 attribute
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* nla_get_s64(nla) get payload for a s64 attribute
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* nla_get_flag(nla) return 1 if flag is true
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* nla_get_msecs(nla) get payload for a msecs attribute
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*
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* Attribute Misc:
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* nla_memcpy(dest, nla, count) copy attribute into memory
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* nla_memcmp(nla, data, size) compare attribute with memory area
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* nla_strscpy(dst, nla, size) copy attribute to a sized string
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* nla_strcmp(nla, str) compare attribute with string
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*
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* Attribute Parsing:
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* nla_ok(nla, remaining) does nla fit into remaining bytes?
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* nla_next(nla, remaining) get next netlink attribute
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* nla_validate() validate a stream of attributes
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* nla_validate_nested() validate a stream of nested attributes
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* nla_find() find attribute in stream of attributes
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* nla_find_nested() find attribute in nested attributes
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* nla_parse() parse and validate stream of attrs
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* nla_parse_nested() parse nested attributes
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* nla_for_each_attr() loop over all attributes
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* nla_for_each_nested() loop over the nested attributes
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*=========================================================================
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*/
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/**
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* Standard attribute types to specify validation policy
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*/
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enum {
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NLA_UNSPEC,
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NLA_U8,
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NLA_U16,
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NLA_U32,
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NLA_U64,
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NLA_STRING,
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NLA_FLAG,
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NLA_MSECS,
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NLA_NESTED,
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NLA_NESTED_ARRAY,
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NLA_NUL_STRING,
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NLA_BINARY,
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NLA_S8,
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NLA_S16,
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NLA_S32,
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NLA_S64,
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NLA_BITFIELD32,
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NLA_REJECT,
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NLA_BE16,
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NLA_BE32,
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NLA_SINT,
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NLA_UINT,
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__NLA_TYPE_MAX,
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};
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#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
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struct netlink_range_validation {
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u64 min, max;
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};
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struct netlink_range_validation_signed {
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s64 min, max;
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};
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enum nla_policy_validation {
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NLA_VALIDATE_NONE,
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NLA_VALIDATE_RANGE,
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NLA_VALIDATE_RANGE_WARN_TOO_LONG,
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NLA_VALIDATE_MIN,
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NLA_VALIDATE_MAX,
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NLA_VALIDATE_MASK,
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NLA_VALIDATE_RANGE_PTR,
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NLA_VALIDATE_FUNCTION,
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};
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/**
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* struct nla_policy - attribute validation policy
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* @type: Type of attribute or NLA_UNSPEC
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* @validation_type: type of attribute validation done in addition to
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* type-specific validation (e.g. range, function call), see
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* &enum nla_policy_validation
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* @len: Type specific length of payload
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*
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* Policies are defined as arrays of this struct, the array must be
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* accessible by attribute type up to the highest identifier to be expected.
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*
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* Meaning of `len' field:
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* NLA_STRING Maximum length of string
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* NLA_NUL_STRING Maximum length of string (excluding NUL)
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* NLA_FLAG Unused
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* NLA_BINARY Maximum length of attribute payload
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* (but see also below with the validation type)
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* NLA_NESTED,
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* NLA_NESTED_ARRAY Length verification is done by checking len of
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* nested header (or empty); len field is used if
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* nested_policy is also used, for the max attr
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* number in the nested policy.
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* NLA_SINT, NLA_UINT,
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* NLA_U8, NLA_U16,
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* NLA_U32, NLA_U64,
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* NLA_S8, NLA_S16,
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* NLA_S32, NLA_S64,
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* NLA_BE16, NLA_BE32,
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* NLA_MSECS Leaving the length field zero will verify the
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* given type fits, using it verifies minimum length
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* just like "All other"
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* NLA_BITFIELD32 Unused
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* NLA_REJECT Unused
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* All other Minimum length of attribute payload
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*
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* Meaning of validation union:
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* NLA_BITFIELD32 This is a 32-bit bitmap/bitselector attribute and
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* `bitfield32_valid' is the u32 value of valid flags
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* NLA_REJECT This attribute is always rejected and `reject_message'
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* may point to a string to report as the error instead
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* of the generic one in extended ACK.
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* NLA_NESTED `nested_policy' to a nested policy to validate, must
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* also set `len' to the max attribute number. Use the
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* provided NLA_POLICY_NESTED() macro.
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* Note that nla_parse() will validate, but of course not
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* parse, the nested sub-policies.
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* NLA_NESTED_ARRAY `nested_policy' points to a nested policy to validate,
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* must also set `len' to the max attribute number. Use
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* the provided NLA_POLICY_NESTED_ARRAY() macro.
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* The difference to NLA_NESTED is the structure:
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* NLA_NESTED has the nested attributes directly inside
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* while an array has the nested attributes at another
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* level down and the attribute types directly in the
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* nesting don't matter.
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* NLA_UINT,
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* NLA_U8,
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* NLA_U16,
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* NLA_U32,
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* NLA_U64,
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* NLA_BE16,
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* NLA_BE32,
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* NLA_SINT,
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* NLA_S8,
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* NLA_S16,
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* NLA_S32,
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* NLA_S64 The `min' and `max' fields are used depending on the
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* validation_type field, if that is min/max/range then
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* the min, max or both are used (respectively) to check
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* the value of the integer attribute.
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* Note that in the interest of code simplicity and
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* struct size both limits are s16, so you cannot
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* enforce a range that doesn't fall within the range
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* of s16 - do that using the NLA_POLICY_FULL_RANGE()
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* or NLA_POLICY_FULL_RANGE_SIGNED() macros instead.
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* Use the NLA_POLICY_MIN(), NLA_POLICY_MAX() and
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* NLA_POLICY_RANGE() macros.
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* NLA_UINT,
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* NLA_U8,
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* NLA_U16,
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* NLA_U32,
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* NLA_U64 If the validation_type field instead is set to
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* NLA_VALIDATE_RANGE_PTR, `range' must be a pointer
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* to a struct netlink_range_validation that indicates
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* the min/max values.
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* Use NLA_POLICY_FULL_RANGE().
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* NLA_SINT,
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* NLA_S8,
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* NLA_S16,
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* NLA_S32,
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* NLA_S64 If the validation_type field instead is set to
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* NLA_VALIDATE_RANGE_PTR, `range_signed' must be a
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* pointer to a struct netlink_range_validation_signed
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* that indicates the min/max values.
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* Use NLA_POLICY_FULL_RANGE_SIGNED().
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*
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* NLA_BINARY If the validation type is like the ones for integers
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* above, then the min/max length (not value like for
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* integers) of the attribute is enforced.
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*
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* All other Unused - but note that it's a union
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*
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* Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN:
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* NLA_BINARY Validation function called for the attribute.
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* All other Unused - but note that it's a union
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*
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* Example:
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*
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* static const u32 myvalidflags = 0xff231023;
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*
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* static const struct nla_policy my_policy[ATTR_MAX+1] = {
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* [ATTR_FOO] = { .type = NLA_U16 },
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* [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
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* [ATTR_BAZ] = NLA_POLICY_EXACT_LEN(sizeof(struct mystruct)),
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* [ATTR_GOO] = NLA_POLICY_BITFIELD32(myvalidflags),
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* };
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*/
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struct nla_policy {
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u8 type;
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u8 validation_type;
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u16 len;
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union {
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/**
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* @strict_start_type: first attribute to validate strictly
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*
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* This entry is special, and used for the attribute at index 0
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* only, and specifies special data about the policy, namely it
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* specifies the "boundary type" where strict length validation
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* starts for any attribute types >= this value, also, strict
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* nesting validation starts here.
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*
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* Additionally, it means that NLA_UNSPEC is actually NLA_REJECT
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* for any types >= this, so need to use NLA_POLICY_MIN_LEN() to
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* get the previous pure { .len = xyz } behaviour. The advantage
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* of this is that types not specified in the policy will be
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* rejected.
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*
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* For completely new families it should be set to 1 so that the
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* validation is enforced for all attributes. For existing ones
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* it should be set at least when new attributes are added to
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* the enum used by the policy, and be set to the new value that
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* was added to enforce strict validation from thereon.
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*/
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u16 strict_start_type;
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/* private: use NLA_POLICY_*() to set */
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const u32 bitfield32_valid;
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const u32 mask;
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const char *reject_message;
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const struct nla_policy *nested_policy;
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const struct netlink_range_validation *range;
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const struct netlink_range_validation_signed *range_signed;
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struct {
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s16 min, max;
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};
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int (*validate)(const struct nlattr *attr,
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struct netlink_ext_ack *extack);
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};
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};
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#define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN)
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#define NLA_POLICY_ETH_ADDR_COMPAT NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN)
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#define _NLA_POLICY_NESTED(maxattr, policy) \
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{ .type = NLA_NESTED, .nested_policy = policy, .len = maxattr }
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#define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \
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{ .type = NLA_NESTED_ARRAY, .nested_policy = policy, .len = maxattr }
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#define NLA_POLICY_NESTED(policy) \
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_NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy)
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#define NLA_POLICY_NESTED_ARRAY(policy) \
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_NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy)
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#define NLA_POLICY_BITFIELD32(valid) \
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{ .type = NLA_BITFIELD32, .bitfield32_valid = valid }
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#define __NLA_IS_UINT_TYPE(tp) \
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(tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || \
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tp == NLA_U64 || tp == NLA_UINT || \
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tp == NLA_BE16 || tp == NLA_BE32)
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#define __NLA_IS_SINT_TYPE(tp) \
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(tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64 || \
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tp == NLA_SINT)
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#define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
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#define NLA_ENSURE_UINT_TYPE(tp) \
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(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp)) + tp)
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#define NLA_ENSURE_UINT_OR_BINARY_TYPE(tp) \
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(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \
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tp == NLA_MSECS || \
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tp == NLA_BINARY) + tp)
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#define NLA_ENSURE_SINT_TYPE(tp) \
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(__NLA_ENSURE(__NLA_IS_SINT_TYPE(tp)) + tp)
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#define NLA_ENSURE_INT_OR_BINARY_TYPE(tp) \
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(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \
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__NLA_IS_SINT_TYPE(tp) || \
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tp == NLA_MSECS || \
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tp == NLA_BINARY) + tp)
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#define NLA_ENSURE_NO_VALIDATION_PTR(tp) \
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(__NLA_ENSURE(tp != NLA_BITFIELD32 && \
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tp != NLA_REJECT && \
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tp != NLA_NESTED && \
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tp != NLA_NESTED_ARRAY) + tp)
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#define NLA_POLICY_RANGE(tp, _min, _max) { \
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.type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \
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.validation_type = NLA_VALIDATE_RANGE, \
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.min = _min, \
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.max = _max \
|
|
}
|
|
|
|
#define NLA_POLICY_FULL_RANGE(tp, _range) { \
|
|
.type = NLA_ENSURE_UINT_OR_BINARY_TYPE(tp), \
|
|
.validation_type = NLA_VALIDATE_RANGE_PTR, \
|
|
.range = _range, \
|
|
}
|
|
|
|
#define NLA_POLICY_FULL_RANGE_SIGNED(tp, _range) { \
|
|
.type = NLA_ENSURE_SINT_TYPE(tp), \
|
|
.validation_type = NLA_VALIDATE_RANGE_PTR, \
|
|
.range_signed = _range, \
|
|
}
|
|
|
|
#define NLA_POLICY_MIN(tp, _min) { \
|
|
.type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \
|
|
.validation_type = NLA_VALIDATE_MIN, \
|
|
.min = _min, \
|
|
}
|
|
|
|
#define NLA_POLICY_MAX(tp, _max) { \
|
|
.type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \
|
|
.validation_type = NLA_VALIDATE_MAX, \
|
|
.max = _max, \
|
|
}
|
|
|
|
#define NLA_POLICY_MASK(tp, _mask) { \
|
|
.type = NLA_ENSURE_UINT_TYPE(tp), \
|
|
.validation_type = NLA_VALIDATE_MASK, \
|
|
.mask = _mask, \
|
|
}
|
|
|
|
#define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \
|
|
.type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \
|
|
.validation_type = NLA_VALIDATE_FUNCTION, \
|
|
.validate = fn, \
|
|
.len = __VA_ARGS__ + 0, \
|
|
}
|
|
|
|
#define NLA_POLICY_EXACT_LEN(_len) NLA_POLICY_RANGE(NLA_BINARY, _len, _len)
|
|
#define NLA_POLICY_EXACT_LEN_WARN(_len) { \
|
|
.type = NLA_BINARY, \
|
|
.validation_type = NLA_VALIDATE_RANGE_WARN_TOO_LONG, \
|
|
.min = _len, \
|
|
.max = _len \
|
|
}
|
|
#define NLA_POLICY_MIN_LEN(_len) NLA_POLICY_MIN(NLA_BINARY, _len)
|
|
|
|
/**
|
|
* struct nl_info - netlink source information
|
|
* @nlh: Netlink message header of original request
|
|
* @nl_net: Network namespace
|
|
* @portid: Netlink PORTID of requesting application
|
|
* @skip_notify: Skip netlink notifications to user space
|
|
* @skip_notify_kernel: Skip selected in-kernel notifications
|
|
*/
|
|
struct nl_info {
|
|
struct nlmsghdr *nlh;
|
|
struct net *nl_net;
|
|
u32 portid;
|
|
u8 skip_notify:1,
|
|
skip_notify_kernel:1;
|
|
};
|
|
|
|
/**
|
|
* enum netlink_validation - netlink message/attribute validation levels
|
|
* @NL_VALIDATE_LIBERAL: Old-style "be liberal" validation, not caring about
|
|
* extra data at the end of the message, attributes being longer than
|
|
* they should be, or unknown attributes being present.
|
|
* @NL_VALIDATE_TRAILING: Reject junk data encountered after attribute parsing.
|
|
* @NL_VALIDATE_MAXTYPE: Reject attributes > max type; Together with _TRAILING
|
|
* this is equivalent to the old nla_parse_strict()/nlmsg_parse_strict().
|
|
* @NL_VALIDATE_UNSPEC: Reject attributes with NLA_UNSPEC in the policy.
|
|
* This can safely be set by the kernel when the given policy has no
|
|
* NLA_UNSPEC anymore, and can thus be used to ensure policy entries
|
|
* are enforced going forward.
|
|
* @NL_VALIDATE_STRICT_ATTRS: strict attribute policy parsing (e.g.
|
|
* U8, U16, U32 must have exact size, etc.)
|
|
* @NL_VALIDATE_NESTED: Check that NLA_F_NESTED is set for NLA_NESTED(_ARRAY)
|
|
* and unset for other policies.
|
|
*/
|
|
enum netlink_validation {
|
|
NL_VALIDATE_LIBERAL = 0,
|
|
NL_VALIDATE_TRAILING = BIT(0),
|
|
NL_VALIDATE_MAXTYPE = BIT(1),
|
|
NL_VALIDATE_UNSPEC = BIT(2),
|
|
NL_VALIDATE_STRICT_ATTRS = BIT(3),
|
|
NL_VALIDATE_NESTED = BIT(4),
|
|
};
|
|
|
|
#define NL_VALIDATE_DEPRECATED_STRICT (NL_VALIDATE_TRAILING |\
|
|
NL_VALIDATE_MAXTYPE)
|
|
#define NL_VALIDATE_STRICT (NL_VALIDATE_TRAILING |\
|
|
NL_VALIDATE_MAXTYPE |\
|
|
NL_VALIDATE_UNSPEC |\
|
|
NL_VALIDATE_STRICT_ATTRS |\
|
|
NL_VALIDATE_NESTED)
|
|
|
|
int netlink_rcv_skb(struct sk_buff *skb,
|
|
int (*cb)(struct sk_buff *, struct nlmsghdr *,
|
|
struct netlink_ext_ack *));
|
|
int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
|
|
unsigned int group, int report, gfp_t flags);
|
|
|
|
int __nla_validate(const struct nlattr *head, int len, int maxtype,
|
|
const struct nla_policy *policy, unsigned int validate,
|
|
struct netlink_ext_ack *extack);
|
|
int __nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
|
|
int len, const struct nla_policy *policy, unsigned int validate,
|
|
struct netlink_ext_ack *extack);
|
|
int nla_policy_len(const struct nla_policy *, int);
|
|
struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype);
|
|
ssize_t nla_strscpy(char *dst, const struct nlattr *nla, size_t dstsize);
|
|
char *nla_strdup(const struct nlattr *nla, gfp_t flags);
|
|
int nla_memcpy(void *dest, const struct nlattr *src, int count);
|
|
int nla_memcmp(const struct nlattr *nla, const void *data, size_t size);
|
|
int nla_strcmp(const struct nlattr *nla, const char *str);
|
|
struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
|
|
struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype,
|
|
int attrlen, int padattr);
|
|
void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
|
|
struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
|
|
struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype,
|
|
int attrlen, int padattr);
|
|
void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
|
|
void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,
|
|
const void *data);
|
|
void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
|
|
const void *data, int padattr);
|
|
void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
|
|
int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
|
|
int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
|
|
const void *data, int padattr);
|
|
int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
|
|
int nla_append(struct sk_buff *skb, int attrlen, const void *data);
|
|
|
|
/**************************************************************************
|
|
* Netlink Messages
|
|
**************************************************************************/
|
|
|
|
/**
|
|
* nlmsg_msg_size - length of netlink message not including padding
|
|
* @payload: length of message payload
|
|
*/
|
|
static inline int nlmsg_msg_size(int payload)
|
|
{
|
|
return NLMSG_HDRLEN + payload;
|
|
}
|
|
|
|
/**
|
|
* nlmsg_total_size - length of netlink message including padding
|
|
* @payload: length of message payload
|
|
*/
|
|
static inline int nlmsg_total_size(int payload)
|
|
{
|
|
return NLMSG_ALIGN(nlmsg_msg_size(payload));
|
|
}
|
|
|
|
/**
|
|
* nlmsg_padlen - length of padding at the message's tail
|
|
* @payload: length of message payload
|
|
*/
|
|
static inline int nlmsg_padlen(int payload)
|
|
{
|
|
return nlmsg_total_size(payload) - nlmsg_msg_size(payload);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_data - head of message payload
|
|
* @nlh: netlink message header
|
|
*/
|
|
static inline void *nlmsg_data(const struct nlmsghdr *nlh)
|
|
{
|
|
return (unsigned char *) nlh + NLMSG_HDRLEN;
|
|
}
|
|
|
|
/**
|
|
* nlmsg_len - length of message payload
|
|
* @nlh: netlink message header
|
|
*/
|
|
static inline int nlmsg_len(const struct nlmsghdr *nlh)
|
|
{
|
|
return nlh->nlmsg_len - NLMSG_HDRLEN;
|
|
}
|
|
|
|
/**
|
|
* nlmsg_attrdata - head of attributes data
|
|
* @nlh: netlink message header
|
|
* @hdrlen: length of family specific header
|
|
*/
|
|
static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh,
|
|
int hdrlen)
|
|
{
|
|
unsigned char *data = nlmsg_data(nlh);
|
|
return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen));
|
|
}
|
|
|
|
/**
|
|
* nlmsg_attrlen - length of attributes data
|
|
* @nlh: netlink message header
|
|
* @hdrlen: length of family specific header
|
|
*/
|
|
static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen)
|
|
{
|
|
return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_ok - check if the netlink message fits into the remaining bytes
|
|
* @nlh: netlink message header
|
|
* @remaining: number of bytes remaining in message stream
|
|
*/
|
|
static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining)
|
|
{
|
|
return (remaining >= (int) sizeof(struct nlmsghdr) &&
|
|
nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&
|
|
nlh->nlmsg_len <= remaining);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_next - next netlink message in message stream
|
|
* @nlh: netlink message header
|
|
* @remaining: number of bytes remaining in message stream
|
|
*
|
|
* Returns the next netlink message in the message stream and
|
|
* decrements remaining by the size of the current message.
|
|
*/
|
|
static inline struct nlmsghdr *
|
|
nlmsg_next(const struct nlmsghdr *nlh, int *remaining)
|
|
{
|
|
int totlen = NLMSG_ALIGN(nlh->nlmsg_len);
|
|
|
|
*remaining -= totlen;
|
|
|
|
return (struct nlmsghdr *) ((unsigned char *) nlh + totlen);
|
|
}
|
|
|
|
/**
|
|
* nla_parse - Parse a stream of attributes into a tb buffer
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @policy: validation policy
|
|
* @extack: extended ACK pointer
|
|
*
|
|
* Parses a stream of attributes and stores a pointer to each attribute in
|
|
* the tb array accessible via the attribute type. Attributes with a type
|
|
* exceeding maxtype will be rejected, policy must be specified, attributes
|
|
* will be validated in the strictest way possible.
|
|
*
|
|
* Returns 0 on success or a negative error code.
|
|
*/
|
|
static inline int nla_parse(struct nlattr **tb, int maxtype,
|
|
const struct nlattr *head, int len,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_parse(tb, maxtype, head, len, policy,
|
|
NL_VALIDATE_STRICT, extack);
|
|
}
|
|
|
|
/**
|
|
* nla_parse_deprecated - Parse a stream of attributes into a tb buffer
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @policy: validation policy
|
|
* @extack: extended ACK pointer
|
|
*
|
|
* Parses a stream of attributes and stores a pointer to each attribute in
|
|
* the tb array accessible via the attribute type. Attributes with a type
|
|
* exceeding maxtype will be ignored and attributes from the policy are not
|
|
* always strictly validated (only for new attributes).
|
|
*
|
|
* Returns 0 on success or a negative error code.
|
|
*/
|
|
static inline int nla_parse_deprecated(struct nlattr **tb, int maxtype,
|
|
const struct nlattr *head, int len,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_parse(tb, maxtype, head, len, policy,
|
|
NL_VALIDATE_LIBERAL, extack);
|
|
}
|
|
|
|
/**
|
|
* nla_parse_deprecated_strict - Parse a stream of attributes into a tb buffer
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @policy: validation policy
|
|
* @extack: extended ACK pointer
|
|
*
|
|
* Parses a stream of attributes and stores a pointer to each attribute in
|
|
* the tb array accessible via the attribute type. Attributes with a type
|
|
* exceeding maxtype will be rejected as well as trailing data, but the
|
|
* policy is not completely strictly validated (only for new attributes).
|
|
*
|
|
* Returns 0 on success or a negative error code.
|
|
*/
|
|
static inline int nla_parse_deprecated_strict(struct nlattr **tb, int maxtype,
|
|
const struct nlattr *head,
|
|
int len,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_parse(tb, maxtype, head, len, policy,
|
|
NL_VALIDATE_DEPRECATED_STRICT, extack);
|
|
}
|
|
|
|
/**
|
|
* __nlmsg_parse - parse attributes of a netlink message
|
|
* @nlh: netlink message header
|
|
* @hdrlen: length of family specific header
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @validate: validation strictness
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* See nla_parse()
|
|
*/
|
|
static inline int __nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
|
|
struct nlattr *tb[], int maxtype,
|
|
const struct nla_policy *policy,
|
|
unsigned int validate,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) {
|
|
NL_SET_ERR_MSG(extack, "Invalid header length");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return __nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen),
|
|
nlmsg_attrlen(nlh, hdrlen), policy, validate,
|
|
extack);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_parse - parse attributes of a netlink message
|
|
* @nlh: netlink message header
|
|
* @hdrlen: length of family specific header
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* See nla_parse()
|
|
*/
|
|
static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
|
|
struct nlattr *tb[], int maxtype,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
|
|
NL_VALIDATE_STRICT, extack);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_parse_deprecated - parse attributes of a netlink message
|
|
* @nlh: netlink message header
|
|
* @hdrlen: length of family specific header
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* See nla_parse_deprecated()
|
|
*/
|
|
static inline int nlmsg_parse_deprecated(const struct nlmsghdr *nlh, int hdrlen,
|
|
struct nlattr *tb[], int maxtype,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
|
|
NL_VALIDATE_LIBERAL, extack);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_parse_deprecated_strict - parse attributes of a netlink message
|
|
* @nlh: netlink message header
|
|
* @hdrlen: length of family specific header
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* See nla_parse_deprecated_strict()
|
|
*/
|
|
static inline int
|
|
nlmsg_parse_deprecated_strict(const struct nlmsghdr *nlh, int hdrlen,
|
|
struct nlattr *tb[], int maxtype,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
|
|
NL_VALIDATE_DEPRECATED_STRICT, extack);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_find_attr - find a specific attribute in a netlink message
|
|
* @nlh: netlink message header
|
|
* @hdrlen: length of familiy specific header
|
|
* @attrtype: type of attribute to look for
|
|
*
|
|
* Returns the first attribute which matches the specified type.
|
|
*/
|
|
static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh,
|
|
int hdrlen, int attrtype)
|
|
{
|
|
return nla_find(nlmsg_attrdata(nlh, hdrlen),
|
|
nlmsg_attrlen(nlh, hdrlen), attrtype);
|
|
}
|
|
|
|
/**
|
|
* nla_validate_deprecated - Validate a stream of attributes
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* Validates all attributes in the specified attribute stream against the
|
|
* specified policy. Validation is done in liberal mode.
|
|
* See documenation of struct nla_policy for more details.
|
|
*
|
|
* Returns 0 on success or a negative error code.
|
|
*/
|
|
static inline int nla_validate_deprecated(const struct nlattr *head, int len,
|
|
int maxtype,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_LIBERAL,
|
|
extack);
|
|
}
|
|
|
|
/**
|
|
* nla_validate - Validate a stream of attributes
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* Validates all attributes in the specified attribute stream against the
|
|
* specified policy. Validation is done in strict mode.
|
|
* See documenation of struct nla_policy for more details.
|
|
*
|
|
* Returns 0 on success or a negative error code.
|
|
*/
|
|
static inline int nla_validate(const struct nlattr *head, int len, int maxtype,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_STRICT,
|
|
extack);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_validate_deprecated - validate a netlink message including attributes
|
|
* @nlh: netlinket message header
|
|
* @hdrlen: length of familiy specific header
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @extack: extended ACK report struct
|
|
*/
|
|
static inline int nlmsg_validate_deprecated(const struct nlmsghdr *nlh,
|
|
int hdrlen, int maxtype,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
|
|
return -EINVAL;
|
|
|
|
return __nla_validate(nlmsg_attrdata(nlh, hdrlen),
|
|
nlmsg_attrlen(nlh, hdrlen), maxtype,
|
|
policy, NL_VALIDATE_LIBERAL, extack);
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* 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(const struct nlmsghdr *nlh)
|
|
{
|
|
return nlh ? !!(nlh->nlmsg_flags & NLM_F_ECHO) : 0;
|
|
}
|
|
|
|
/**
|
|
* nlmsg_seq - return the seq number of netlink message
|
|
* @nlh: netlink message header
|
|
*
|
|
* Returns 0 if netlink message is NULL
|
|
*/
|
|
static inline u32 nlmsg_seq(const struct nlmsghdr *nlh)
|
|
{
|
|
return nlh ? nlh->nlmsg_seq : 0;
|
|
}
|
|
|
|
/**
|
|
* nlmsg_for_each_attr - iterate over a stream of attributes
|
|
* @pos: loop counter, set to current attribute
|
|
* @nlh: netlink message header
|
|
* @hdrlen: length of familiy specific header
|
|
* @rem: initialized to len, holds bytes currently remaining in stream
|
|
*/
|
|
#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
|
|
nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
|
|
nlmsg_attrlen(nlh, hdrlen), rem)
|
|
|
|
/**
|
|
* nlmsg_put - Add a new netlink message to an skb
|
|
* @skb: socket buffer to store message in
|
|
* @portid: netlink PORTID of requesting application
|
|
* @seq: sequence number of message
|
|
* @type: message type
|
|
* @payload: length of message payload
|
|
* @flags: message flags
|
|
*
|
|
* Returns NULL if the tailroom of the skb is insufficient to store
|
|
* the message header and payload.
|
|
*/
|
|
static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
|
|
int type, int payload, int flags)
|
|
{
|
|
if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload)))
|
|
return NULL;
|
|
|
|
return __nlmsg_put(skb, portid, seq, type, payload, flags);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_append - Add more data to a nlmsg in a skb
|
|
* @skb: socket buffer to store message in
|
|
* @size: length of message payload
|
|
*
|
|
* Append data to an existing nlmsg, used when constructing a message
|
|
* with multiple fixed-format headers (which is rare).
|
|
* Returns NULL if the tailroom of the skb is insufficient to store
|
|
* the extra payload.
|
|
*/
|
|
static inline void *nlmsg_append(struct sk_buff *skb, u32 size)
|
|
{
|
|
if (unlikely(skb_tailroom(skb) < NLMSG_ALIGN(size)))
|
|
return NULL;
|
|
|
|
if (NLMSG_ALIGN(size) - size)
|
|
memset(skb_tail_pointer(skb) + size, 0,
|
|
NLMSG_ALIGN(size) - size);
|
|
return __skb_put(skb, NLMSG_ALIGN(size));
|
|
}
|
|
|
|
/**
|
|
* nlmsg_put_answer - Add a new callback based netlink message to an skb
|
|
* @skb: socket buffer to store message in
|
|
* @cb: netlink callback
|
|
* @type: message type
|
|
* @payload: length of message payload
|
|
* @flags: message flags
|
|
*
|
|
* Returns NULL if the tailroom of the skb is insufficient to store
|
|
* the message header and payload.
|
|
*/
|
|
static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
int type, int payload,
|
|
int flags)
|
|
{
|
|
return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
|
|
type, payload, flags);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_new - Allocate a new netlink message
|
|
* @payload: size of the message payload
|
|
* @flags: the type of memory to allocate.
|
|
*
|
|
* 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(size_t payload, gfp_t flags)
|
|
{
|
|
return alloc_skb(nlmsg_total_size(payload), flags);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_new_large - Allocate a new netlink message with non-contiguous
|
|
* physical memory
|
|
* @payload: size of the message payload
|
|
*
|
|
* The allocated skb is unable to have frag page for shinfo->frags*,
|
|
* as the NULL setting for skb->head in netlink_skb_destructor() will
|
|
* bypass most of the handling in skb_release_data()
|
|
*/
|
|
static inline struct sk_buff *nlmsg_new_large(size_t payload)
|
|
{
|
|
return netlink_alloc_large_skb(nlmsg_total_size(payload), 0);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_end - Finalize a netlink message
|
|
* @skb: socket buffer the message is stored in
|
|
* @nlh: netlink message header
|
|
*
|
|
* Corrects the netlink message header to include the appeneded
|
|
* attributes. Only necessary if attributes have been added to
|
|
* the message.
|
|
*/
|
|
static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
static inline void nlmsg_trim(struct sk_buff *skb, const void *mark)
|
|
{
|
|
if (mark) {
|
|
WARN_ON((unsigned char *) mark < skb->data);
|
|
skb_trim(skb, (unsigned char *) mark - skb->data);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nlmsg_cancel - Cancel construction of a netlink message
|
|
* @skb: socket buffer the message is stored in
|
|
* @nlh: netlink message header
|
|
*
|
|
* Removes the complete netlink message including all
|
|
* attributes from the socket buffer again.
|
|
*/
|
|
static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
nlmsg_trim(skb, nlh);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_free - free a netlink message
|
|
* @skb: socket buffer of netlink message
|
|
*/
|
|
static inline void nlmsg_free(struct sk_buff *skb)
|
|
{
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_multicast_filtered - multicast a netlink message with filter function
|
|
* @sk: netlink socket to spread messages to
|
|
* @skb: netlink message as socket buffer
|
|
* @portid: own netlink portid to avoid sending to yourself
|
|
* @group: multicast group id
|
|
* @flags: allocation flags
|
|
* @filter: filter function
|
|
* @filter_data: filter function private data
|
|
*
|
|
* Return: 0 on success, negative error code for failure.
|
|
*/
|
|
static inline int nlmsg_multicast_filtered(struct sock *sk, struct sk_buff *skb,
|
|
u32 portid, unsigned int group,
|
|
gfp_t flags,
|
|
netlink_filter_fn filter,
|
|
void *filter_data)
|
|
{
|
|
int err;
|
|
|
|
NETLINK_CB(skb).dst_group = group;
|
|
|
|
err = netlink_broadcast_filtered(sk, skb, portid, group, flags,
|
|
filter, filter_data);
|
|
if (err > 0)
|
|
err = 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nlmsg_multicast - multicast a netlink message
|
|
* @sk: netlink socket to spread messages to
|
|
* @skb: netlink message as socket buffer
|
|
* @portid: own netlink portid 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 portid, unsigned int group, gfp_t flags)
|
|
{
|
|
return nlmsg_multicast_filtered(sk, skb, portid, group, flags,
|
|
NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* nlmsg_unicast - unicast a netlink message
|
|
* @sk: netlink socket to spread message to
|
|
* @skb: netlink message as socket buffer
|
|
* @portid: netlink portid of the destination socket
|
|
*/
|
|
static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid)
|
|
{
|
|
int err;
|
|
|
|
err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT);
|
|
if (err > 0)
|
|
err = 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nlmsg_for_each_msg - iterate over a stream of messages
|
|
* @pos: loop counter, set to current message
|
|
* @head: head of message stream
|
|
* @len: length of message stream
|
|
* @rem: initialized to len, holds bytes currently remaining in stream
|
|
*/
|
|
#define nlmsg_for_each_msg(pos, head, len, rem) \
|
|
for (pos = head, rem = len; \
|
|
nlmsg_ok(pos, rem); \
|
|
pos = nlmsg_next(pos, &(rem)))
|
|
|
|
/**
|
|
* nl_dump_check_consistent - check if sequence is consistent and advertise if not
|
|
* @cb: netlink callback structure that stores the sequence number
|
|
* @nlh: netlink message header to write the flag to
|
|
*
|
|
* This function checks if the sequence (generation) number changed during dump
|
|
* and if it did, advertises it in the netlink message header.
|
|
*
|
|
* The correct way to use it is to set cb->seq to the generation counter when
|
|
* all locks for dumping have been acquired, and then call this function for
|
|
* each message that is generated.
|
|
*
|
|
* Note that due to initialisation concerns, 0 is an invalid sequence number
|
|
* and must not be used by code that uses this functionality.
|
|
*/
|
|
static inline void
|
|
nl_dump_check_consistent(struct netlink_callback *cb,
|
|
struct nlmsghdr *nlh)
|
|
{
|
|
if (cb->prev_seq && cb->seq != cb->prev_seq)
|
|
nlh->nlmsg_flags |= NLM_F_DUMP_INTR;
|
|
cb->prev_seq = cb->seq;
|
|
}
|
|
|
|
/**************************************************************************
|
|
* Netlink Attributes
|
|
**************************************************************************/
|
|
|
|
/**
|
|
* nla_attr_size - length of attribute not including padding
|
|
* @payload: length of payload
|
|
*/
|
|
static inline int nla_attr_size(int payload)
|
|
{
|
|
return NLA_HDRLEN + payload;
|
|
}
|
|
|
|
/**
|
|
* nla_total_size - total length of attribute including padding
|
|
* @payload: length of payload
|
|
*/
|
|
static inline int nla_total_size(int payload)
|
|
{
|
|
return NLA_ALIGN(nla_attr_size(payload));
|
|
}
|
|
|
|
/**
|
|
* nla_padlen - length of padding at the tail of attribute
|
|
* @payload: length of payload
|
|
*/
|
|
static inline int nla_padlen(int payload)
|
|
{
|
|
return nla_total_size(payload) - nla_attr_size(payload);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static inline void *nla_data(const struct nlattr *nla)
|
|
{
|
|
return (char *) nla + NLA_HDRLEN;
|
|
}
|
|
|
|
/**
|
|
* nla_len - length of payload
|
|
* @nla: netlink attribute
|
|
*/
|
|
static inline u16 nla_len(const struct nlattr *nla)
|
|
{
|
|
return nla->nla_len - NLA_HDRLEN;
|
|
}
|
|
|
|
/**
|
|
* nla_ok - check if the netlink attribute fits into the remaining bytes
|
|
* @nla: netlink attribute
|
|
* @remaining: number of bytes remaining in attribute stream
|
|
*/
|
|
static inline int nla_ok(const struct nlattr *nla, int remaining)
|
|
{
|
|
return remaining >= (int) sizeof(*nla) &&
|
|
nla->nla_len >= sizeof(*nla) &&
|
|
nla->nla_len <= remaining;
|
|
}
|
|
|
|
/**
|
|
* nla_next - next netlink attribute in attribute stream
|
|
* @nla: netlink attribute
|
|
* @remaining: number of bytes remaining in attribute stream
|
|
*
|
|
* Returns the next netlink attribute in the attribute stream and
|
|
* decrements remaining by the size of the current attribute.
|
|
*/
|
|
static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining)
|
|
{
|
|
unsigned int totlen = NLA_ALIGN(nla->nla_len);
|
|
|
|
*remaining -= totlen;
|
|
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(const 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
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @nla: attribute containing the nested attributes
|
|
* @policy: validation policy
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* See nla_parse()
|
|
*/
|
|
static inline int nla_parse_nested(struct nlattr *tb[], int maxtype,
|
|
const struct nlattr *nla,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (!(nla->nla_type & NLA_F_NESTED)) {
|
|
NL_SET_ERR_MSG_ATTR(extack, nla, "NLA_F_NESTED is missing");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy,
|
|
NL_VALIDATE_STRICT, extack);
|
|
}
|
|
|
|
/**
|
|
* nla_parse_nested_deprecated - parse nested attributes
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @nla: attribute containing the nested attributes
|
|
* @policy: validation policy
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* See nla_parse_deprecated()
|
|
*/
|
|
static inline int nla_parse_nested_deprecated(struct nlattr *tb[], int maxtype,
|
|
const struct nlattr *nla,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy,
|
|
NL_VALIDATE_LIBERAL, extack);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value)
|
|
{
|
|
/* temporary variables to work around GCC PR81715 with asan-stack=1 */
|
|
u8 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(u8), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_u16 - Add a u16 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value)
|
|
{
|
|
u16 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(u16), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value)
|
|
{
|
|
__be16 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(__be16), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value)
|
|
{
|
|
__be16 tmp = value;
|
|
|
|
return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value)
|
|
{
|
|
__le16 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(__le16), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_u32 - Add a u32 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value)
|
|
{
|
|
u32 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(u32), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_uint - Add a variable-size unsigned int to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_uint(struct sk_buff *skb, int attrtype, u64 value)
|
|
{
|
|
u64 tmp64 = value;
|
|
u32 tmp32 = value;
|
|
|
|
if (tmp64 == tmp32)
|
|
return nla_put_u32(skb, attrtype, tmp32);
|
|
return nla_put(skb, attrtype, sizeof(u64), &tmp64);
|
|
}
|
|
|
|
/**
|
|
* nla_put_be32 - Add a __be32 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value)
|
|
{
|
|
__be32 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(__be32), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value)
|
|
{
|
|
__be32 tmp = value;
|
|
|
|
return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_le32 - Add a __le32 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value)
|
|
{
|
|
__le32 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(__le32), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
* @padattr: attribute type for the padding
|
|
*/
|
|
static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype,
|
|
u64 value, int padattr)
|
|
{
|
|
u64 tmp = value;
|
|
|
|
return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr);
|
|
}
|
|
|
|
/**
|
|
* nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
* @padattr: attribute type for the padding
|
|
*/
|
|
static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value,
|
|
int padattr)
|
|
{
|
|
__be64 tmp = value;
|
|
|
|
return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr);
|
|
}
|
|
|
|
/**
|
|
* nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
* @padattr: attribute type for the padding
|
|
*/
|
|
static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value,
|
|
int padattr)
|
|
{
|
|
__be64 tmp = value;
|
|
|
|
return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp,
|
|
padattr);
|
|
}
|
|
|
|
/**
|
|
* nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
* @padattr: attribute type for the padding
|
|
*/
|
|
static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value,
|
|
int padattr)
|
|
{
|
|
__le64 tmp = value;
|
|
|
|
return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr);
|
|
}
|
|
|
|
/**
|
|
* nla_put_s8 - Add a s8 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value)
|
|
{
|
|
s8 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(s8), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_s16 - Add a s16 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value)
|
|
{
|
|
s16 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(s16), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_s32 - Add a s32 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value)
|
|
{
|
|
s32 tmp = value;
|
|
|
|
return nla_put(skb, attrtype, sizeof(s32), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
* @padattr: attribute type for the padding
|
|
*/
|
|
static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value,
|
|
int padattr)
|
|
{
|
|
s64 tmp = value;
|
|
|
|
return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr);
|
|
}
|
|
|
|
/**
|
|
* nla_put_sint - Add a variable-size signed int to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: numeric value
|
|
*/
|
|
static inline int nla_put_sint(struct sk_buff *skb, int attrtype, s64 value)
|
|
{
|
|
s64 tmp64 = value;
|
|
s32 tmp32 = value;
|
|
|
|
if (tmp64 == tmp32)
|
|
return nla_put_s32(skb, attrtype, tmp32);
|
|
return nla_put(skb, attrtype, sizeof(s64), &tmp64);
|
|
}
|
|
|
|
/**
|
|
* nla_put_string - Add a string netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @str: NUL terminated string
|
|
*/
|
|
static inline int nla_put_string(struct sk_buff *skb, int attrtype,
|
|
const char *str)
|
|
{
|
|
return nla_put(skb, attrtype, strlen(str) + 1, str);
|
|
}
|
|
|
|
/**
|
|
* nla_put_flag - Add a flag netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
*/
|
|
static inline int nla_put_flag(struct sk_buff *skb, int attrtype)
|
|
{
|
|
return nla_put(skb, attrtype, 0, NULL);
|
|
}
|
|
|
|
/**
|
|
* nla_put_msecs - Add a msecs netlink attribute to a skb and align it
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @njiffies: number of jiffies to convert to msecs
|
|
* @padattr: attribute type for the padding
|
|
*/
|
|
static inline int nla_put_msecs(struct sk_buff *skb, int attrtype,
|
|
unsigned long njiffies, int padattr)
|
|
{
|
|
u64 tmp = jiffies_to_msecs(njiffies);
|
|
|
|
return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr);
|
|
}
|
|
|
|
/**
|
|
* nla_put_in_addr - Add an IPv4 address netlink attribute to a socket
|
|
* buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @addr: IPv4 address
|
|
*/
|
|
static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype,
|
|
__be32 addr)
|
|
{
|
|
__be32 tmp = addr;
|
|
|
|
return nla_put_be32(skb, attrtype, tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket
|
|
* buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @addr: IPv6 address
|
|
*/
|
|
static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype,
|
|
const struct in6_addr *addr)
|
|
{
|
|
return nla_put(skb, attrtype, sizeof(*addr), addr);
|
|
}
|
|
|
|
/**
|
|
* nla_put_bitfield32 - Add a bitfield32 netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @value: value carrying bits
|
|
* @selector: selector of valid bits
|
|
*/
|
|
static inline int nla_put_bitfield32(struct sk_buff *skb, int attrtype,
|
|
__u32 value, __u32 selector)
|
|
{
|
|
struct nla_bitfield32 tmp = { value, selector, };
|
|
|
|
return nla_put(skb, attrtype, sizeof(tmp), &tmp);
|
|
}
|
|
|
|
/**
|
|
* nla_get_u32 - return payload of u32 attribute
|
|
* @nla: u32 netlink attribute
|
|
*/
|
|
static inline u32 nla_get_u32(const struct nlattr *nla)
|
|
{
|
|
return *(u32 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_be32 - return payload of __be32 attribute
|
|
* @nla: __be32 netlink attribute
|
|
*/
|
|
static inline __be32 nla_get_be32(const struct nlattr *nla)
|
|
{
|
|
return *(__be32 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_le32 - return payload of __le32 attribute
|
|
* @nla: __le32 netlink attribute
|
|
*/
|
|
static inline __le32 nla_get_le32(const struct nlattr *nla)
|
|
{
|
|
return *(__le32 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_u16 - return payload of u16 attribute
|
|
* @nla: u16 netlink attribute
|
|
*/
|
|
static inline u16 nla_get_u16(const struct nlattr *nla)
|
|
{
|
|
return *(u16 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_be16 - return payload of __be16 attribute
|
|
* @nla: __be16 netlink attribute
|
|
*/
|
|
static inline __be16 nla_get_be16(const 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(const struct nlattr *nla)
|
|
{
|
|
return *(__le16 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_u8 - return payload of u8 attribute
|
|
* @nla: u8 netlink attribute
|
|
*/
|
|
static inline u8 nla_get_u8(const struct nlattr *nla)
|
|
{
|
|
return *(u8 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_u64 - return payload of u64 attribute
|
|
* @nla: u64 netlink attribute
|
|
*/
|
|
static inline u64 nla_get_u64(const struct nlattr *nla)
|
|
{
|
|
u64 tmp;
|
|
|
|
nla_memcpy(&tmp, nla, sizeof(tmp));
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* nla_get_uint - return payload of uint attribute
|
|
* @nla: uint netlink attribute
|
|
*/
|
|
static inline u64 nla_get_uint(const struct nlattr *nla)
|
|
{
|
|
if (nla_len(nla) == sizeof(u32))
|
|
return nla_get_u32(nla);
|
|
return nla_get_u64(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_be64 - return payload of __be64 attribute
|
|
* @nla: __be64 netlink attribute
|
|
*/
|
|
static inline __be64 nla_get_be64(const struct nlattr *nla)
|
|
{
|
|
__be64 tmp;
|
|
|
|
nla_memcpy(&tmp, nla, sizeof(tmp));
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* nla_get_le64 - return payload of __le64 attribute
|
|
* @nla: __le64 netlink attribute
|
|
*/
|
|
static inline __le64 nla_get_le64(const struct nlattr *nla)
|
|
{
|
|
return *(__le64 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_s32 - return payload of s32 attribute
|
|
* @nla: s32 netlink attribute
|
|
*/
|
|
static inline s32 nla_get_s32(const struct nlattr *nla)
|
|
{
|
|
return *(s32 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_s16 - return payload of s16 attribute
|
|
* @nla: s16 netlink attribute
|
|
*/
|
|
static inline s16 nla_get_s16(const struct nlattr *nla)
|
|
{
|
|
return *(s16 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_s8 - return payload of s8 attribute
|
|
* @nla: s8 netlink attribute
|
|
*/
|
|
static inline s8 nla_get_s8(const struct nlattr *nla)
|
|
{
|
|
return *(s8 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_s64 - return payload of s64 attribute
|
|
* @nla: s64 netlink attribute
|
|
*/
|
|
static inline s64 nla_get_s64(const struct nlattr *nla)
|
|
{
|
|
s64 tmp;
|
|
|
|
nla_memcpy(&tmp, nla, sizeof(tmp));
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* nla_get_sint - return payload of uint attribute
|
|
* @nla: uint netlink attribute
|
|
*/
|
|
static inline s64 nla_get_sint(const struct nlattr *nla)
|
|
{
|
|
if (nla_len(nla) == sizeof(s32))
|
|
return nla_get_s32(nla);
|
|
return nla_get_s64(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_flag - return payload of flag attribute
|
|
* @nla: flag netlink attribute
|
|
*/
|
|
static inline int nla_get_flag(const struct nlattr *nla)
|
|
{
|
|
return !!nla;
|
|
}
|
|
|
|
/**
|
|
* nla_get_msecs - return payload of msecs attribute
|
|
* @nla: msecs netlink attribute
|
|
*
|
|
* Returns the number of milliseconds in jiffies.
|
|
*/
|
|
static inline unsigned long nla_get_msecs(const struct nlattr *nla)
|
|
{
|
|
u64 msecs = nla_get_u64(nla);
|
|
|
|
return msecs_to_jiffies((unsigned long) msecs);
|
|
}
|
|
|
|
/**
|
|
* nla_get_in_addr - return payload of IPv4 address attribute
|
|
* @nla: IPv4 address netlink attribute
|
|
*/
|
|
static inline __be32 nla_get_in_addr(const struct nlattr *nla)
|
|
{
|
|
return *(__be32 *) nla_data(nla);
|
|
}
|
|
|
|
/**
|
|
* nla_get_in6_addr - return payload of IPv6 address attribute
|
|
* @nla: IPv6 address netlink attribute
|
|
*/
|
|
static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla)
|
|
{
|
|
struct in6_addr tmp;
|
|
|
|
nla_memcpy(&tmp, nla, sizeof(tmp));
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* nla_get_bitfield32 - return payload of 32 bitfield attribute
|
|
* @nla: nla_bitfield32 attribute
|
|
*/
|
|
static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla)
|
|
{
|
|
struct nla_bitfield32 tmp;
|
|
|
|
nla_memcpy(&tmp, nla, sizeof(tmp));
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* nla_memdup - duplicate attribute memory (kmemdup)
|
|
* @src: netlink attribute to duplicate from
|
|
* @gfp: GFP mask
|
|
*/
|
|
static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp)
|
|
{
|
|
return kmemdup(nla_data(src), nla_len(src), gfp);
|
|
}
|
|
|
|
/**
|
|
* nla_nest_start_noflag - Start a new level of nested attributes
|
|
* @skb: socket buffer to add attributes to
|
|
* @attrtype: attribute type of container
|
|
*
|
|
* This function exists for backward compatibility to use in APIs which never
|
|
* marked their nest attributes with NLA_F_NESTED flag. New APIs should use
|
|
* nla_nest_start() which sets the flag.
|
|
*
|
|
* Returns the container attribute or NULL on error
|
|
*/
|
|
static inline struct nlattr *nla_nest_start_noflag(struct sk_buff *skb,
|
|
int attrtype)
|
|
{
|
|
struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb);
|
|
|
|
if (nla_put(skb, attrtype, 0, NULL) < 0)
|
|
return NULL;
|
|
|
|
return start;
|
|
}
|
|
|
|
/**
|
|
* nla_nest_start - Start a new level of nested attributes, with NLA_F_NESTED
|
|
* @skb: socket buffer to add attributes to
|
|
* @attrtype: attribute type of container
|
|
*
|
|
* Unlike nla_nest_start_noflag(), mark the nest attribute with NLA_F_NESTED
|
|
* flag. This is the preferred function to use in new code.
|
|
*
|
|
* Returns the container attribute or NULL on error
|
|
*/
|
|
static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype)
|
|
{
|
|
return nla_nest_start_noflag(skb, attrtype | NLA_F_NESTED);
|
|
}
|
|
|
|
/**
|
|
* nla_nest_end - Finalize nesting of 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_end(struct sk_buff *skb, struct nlattr *start)
|
|
{
|
|
start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;
|
|
return skb->len;
|
|
}
|
|
|
|
/**
|
|
* nla_nest_cancel - Cancel nesting of attributes
|
|
* @skb: socket buffer the message is stored in
|
|
* @start: container attribute
|
|
*
|
|
* Removes the container attribute and including all nested
|
|
* attributes. Returns -EMSGSIZE
|
|
*/
|
|
static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
|
|
{
|
|
nlmsg_trim(skb, start);
|
|
}
|
|
|
|
/**
|
|
* __nla_validate_nested - Validate a stream of nested attributes
|
|
* @start: container attribute
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @validate: validation strictness
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* 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(const struct nlattr *start, int maxtype,
|
|
const struct nla_policy *policy,
|
|
unsigned int validate,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_validate(nla_data(start), nla_len(start), maxtype, policy,
|
|
validate, extack);
|
|
}
|
|
|
|
static inline int
|
|
nla_validate_nested(const struct nlattr *start, int maxtype,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_validate_nested(start, maxtype, policy,
|
|
NL_VALIDATE_STRICT, extack);
|
|
}
|
|
|
|
static inline int
|
|
nla_validate_nested_deprecated(const struct nlattr *start, int maxtype,
|
|
const struct nla_policy *policy,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_validate_nested(start, maxtype, policy,
|
|
NL_VALIDATE_LIBERAL, extack);
|
|
}
|
|
|
|
/**
|
|
* nla_need_padding_for_64bit - test 64-bit alignment of the next attribute
|
|
* @skb: socket buffer the message is stored in
|
|
*
|
|
* Return true if padding is needed to align the next attribute (nla_data()) to
|
|
* a 64-bit aligned area.
|
|
*/
|
|
static inline bool nla_need_padding_for_64bit(struct sk_buff *skb)
|
|
{
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
/* The nlattr header is 4 bytes in size, that's why we test
|
|
* if the skb->data _is_ aligned. A NOP attribute, plus
|
|
* nlattr header for next attribute, will make nla_data()
|
|
* 8-byte aligned.
|
|
*/
|
|
if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8))
|
|
return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* nla_align_64bit - 64-bit align the nla_data() of next attribute
|
|
* @skb: socket buffer the message is stored in
|
|
* @padattr: attribute type for the padding
|
|
*
|
|
* Conditionally emit a padding netlink attribute in order to make
|
|
* the next attribute we emit have a 64-bit aligned nla_data() area.
|
|
* This will only be done in architectures which do not have
|
|
* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined.
|
|
*
|
|
* Returns zero on success or a negative error code.
|
|
*/
|
|
static inline int nla_align_64bit(struct sk_buff *skb, int padattr)
|
|
{
|
|
if (nla_need_padding_for_64bit(skb) &&
|
|
!nla_reserve(skb, padattr, 0))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nla_total_size_64bit - total length of attribute including padding
|
|
* @payload: length of payload
|
|
*/
|
|
static inline int nla_total_size_64bit(int payload)
|
|
{
|
|
return NLA_ALIGN(nla_attr_size(payload))
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
+ NLA_ALIGN(nla_attr_size(0))
|
|
#endif
|
|
;
|
|
}
|
|
|
|
/**
|
|
* nla_for_each_attr - iterate over a stream of attributes
|
|
* @pos: loop counter, set to current attribute
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @rem: initialized to len, holds bytes currently remaining in stream
|
|
*/
|
|
#define nla_for_each_attr(pos, head, len, rem) \
|
|
for (pos = head, rem = len; \
|
|
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)
|
|
|
|
/**
|
|
* nla_is_last - Test if attribute is last in stream
|
|
* @nla: attribute to test
|
|
* @rem: bytes remaining in stream
|
|
*/
|
|
static inline bool nla_is_last(const struct nlattr *nla, int rem)
|
|
{
|
|
return nla->nla_len == rem;
|
|
}
|
|
|
|
void nla_get_range_unsigned(const struct nla_policy *pt,
|
|
struct netlink_range_validation *range);
|
|
void nla_get_range_signed(const struct nla_policy *pt,
|
|
struct netlink_range_validation_signed *range);
|
|
|
|
struct netlink_policy_dump_state;
|
|
|
|
int netlink_policy_dump_add_policy(struct netlink_policy_dump_state **pstate,
|
|
const struct nla_policy *policy,
|
|
unsigned int maxtype);
|
|
int netlink_policy_dump_get_policy_idx(struct netlink_policy_dump_state *state,
|
|
const struct nla_policy *policy,
|
|
unsigned int maxtype);
|
|
bool netlink_policy_dump_loop(struct netlink_policy_dump_state *state);
|
|
int netlink_policy_dump_write(struct sk_buff *skb,
|
|
struct netlink_policy_dump_state *state);
|
|
int netlink_policy_dump_attr_size_estimate(const struct nla_policy *pt);
|
|
int netlink_policy_dump_write_attr(struct sk_buff *skb,
|
|
const struct nla_policy *pt,
|
|
int nestattr);
|
|
void netlink_policy_dump_free(struct netlink_policy_dump_state *state);
|
|
|
|
#endif
|