€•DŒsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œ translations”Œ LanguagesNode”“”)”}”(hhh]”(hŒ pending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ$/translations/zh_CN/core-api/netlink”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ$/translations/zh_TW/core-api/netlink”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ$/translations/it_IT/core-api/netlink”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ$/translations/ja_JP/core-api/netlink”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ$/translations/ko_KR/core-api/netlink”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ$/translations/sp_SP/core-api/netlink”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ%SPDX-License-Identifier: BSD-3-Clause”h]”hŒ%SPDX-License-Identifier: BSD-3-Clause”…””}”hh£sbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1h¡hhhžhhŸŒ>/var/lib/git/docbuild/linux/Documentation/core-api/netlink.rst”h KubhŒtarget”“”)”}”(hŒ.. _kernel_netlink:”h]”h}”(h]”h ]”h"]”h$]”h&]”Œrefid”Œkernel-netlink”uh1h´h KhhhžhhŸh³ubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒ#Netlink notes for kernel developers”h]”hŒ#Netlink notes for kernel developers”…””}”(hhÉhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhhÄhžhhŸh³h KubhÃ)”}”(hhh]”(hÈ)”}”(hŒGeneral guidance”h]”hŒGeneral guidance”…””}”(hhÚhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhh×hžhhŸh³h K ubhÃ)”}”(hhh]”(hÈ)”}”(hŒAttribute enums”h]”hŒAttribute enums”…””}”(hhëhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhhèhžhhŸh³h K ubhŒ paragraph”“”)”}”(hXOlder families often define "null" attributes and commands with value of ``0`` and named ``unspec``. This is supported (``type: unused``) but should be avoided in new families. The ``unspec`` enum values are not used in practice, so just set the value of the first attribute to ``1``.”h]”(hŒMOlder families often define “null†attributes and commands with value of ”…””}”(hhûhžhhŸNh NubhŒliteral”“”)”}”(hŒ``0``”h]”hŒ0”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhhûubhŒ and named ”…””}”(hhûhžhhŸNh Nubj)”}”(hŒ ``unspec``”h]”hŒunspec”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhhûubhŒ. This is supported (”…””}”(hhûhžhhŸNh Nubj)”}”(hŒ``type: unused``”h]”hŒ type: unused”…””}”(hj)hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhhûubhŒ-) but should be avoided in new families. The ”…””}”(hhûhžhhŸNh Nubj)”}”(hŒ ``unspec``”h]”hŒunspec”…””}”(hj;hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhhûubhŒW enum values are not used in practice, so just set the value of the first attribute to ”…””}”(hhûhžhhŸNh Nubj)”}”(hŒ``1``”h]”hŒ1”…””}”(hjMhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhhûubhŒ.”…””}”(hhûhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h Khhèhžhubeh}”(h]”Œattribute-enums”ah ]”h"]”Œattribute enums”ah$]”h&]”uh1hÂhh×hžhhŸh³h K ubhÃ)”}”(hhh]”(hÈ)”}”(hŒ Message enums”h]”hŒ Message enums”…””}”(hjphžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjmhžhhŸh³h Kubhú)”}”(hŒyUse the same command IDs for requests and replies. This makes it easier to match them up, and we have plenty of ID space.”h]”hŒyUse the same command IDs for requests and replies. This makes it easier to match them up, and we have plenty of ID space.”…””}”(hj~hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h Khjmhžhubhú)”}”(hŒ´Use separate command IDs for notifications. This makes it easier to sort the notifications from replies (and present them to the user application via a different API than replies).”h]”hŒ´Use separate command IDs for notifications. This makes it easier to sort the notifications from replies (and present them to the user application via a different API than replies).”…””}”(hjŒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h Khjmhžhubeh}”(h]”Œ message-enums”ah ]”h"]”Œ message enums”ah$]”h&]”uh1hÂhh×hžhhŸh³h KubhÃ)”}”(hhh]”(hÈ)”}”(hŒAnswer requests”h]”hŒAnswer requests”…””}”(hj¥hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj¢hžhhŸh³h Kubhú)”}”(hX_Older families do not reply to all of the commands, especially NEW / ADD commands. User only gets information whether the operation succeeded or not via the ACK. Try to find useful data to return. Once the command is added whether it replies with a full message or only an ACK is uAPI and cannot be changed. It's better to err on the side of replying.”h]”hXaOlder families do not reply to all of the commands, especially NEW / ADD commands. User only gets information whether the operation succeeded or not via the ACK. Try to find useful data to return. Once the command is added whether it replies with a full message or only an ACK is uAPI and cannot be changed. It’s better to err on the side of replying.”…””}”(hj³hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h K!hj¢hžhubhú)”}”(hŒ´Specifically NEW and ADD commands should reply with information identifying the created object such as the allocated object's ID (without having to resort to using ``NLM_F_ECHO``).”h]”(hŒ¦Specifically NEW and ADD commands should reply with information identifying the created object such as the allocated object’s ID (without having to resort to using ”…””}”(hjÁhžhhŸNh Nubj)”}”(hŒ``NLM_F_ECHO``”h]”hŒ NLM_F_ECHO”…””}”(hjÉhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjÁubhŒ).”…””}”(hjÁhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h K'hj¢hžhubeh}”(h]”Œanswer-requests”ah ]”h"]”Œanswer requests”ah$]”h&]”uh1hÂhh×hžhhŸh³h KubhÃ)”}”(hhh]”(hÈ)”}”(hŒ NLM_F_ECHO”h]”hŒ NLM_F_ECHO”…””}”(hjìhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjéhžhhŸh³h K,ubhú)”}”(hŒÇMake sure to pass the request info to genl_notify() to allow ``NLM_F_ECHO`` to take effect. This is useful for programs that need precise feedback from the kernel (for example for logging purposes).”h]”(hŒ=Make sure to pass the request info to genl_notify() to allow ”…””}”(hjúhžhhŸNh Nubj)”}”(hŒ``NLM_F_ECHO``”h]”hŒ NLM_F_ECHO”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjúubhŒ| to take effect. This is useful for programs that need precise feedback from the kernel (for example for logging purposes).”…””}”(hjúhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h K.hjéhžhubeh}”(h]”Œ nlm-f-echo”ah ]”h"]”Œ nlm_f_echo”ah$]”h&]”uh1hÂhh×hžhhŸh³h K,ubhÃ)”}”(hhh]”(hÈ)”}”(hŒSupport dump consistency”h]”hŒSupport dump consistency”…””}”(hj%hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj"hžhhŸh³h K3ubhú)”}”(hXIf iterating over objects during dump may skip over objects or repeat them - make sure to report dump inconsistency with ``NLM_F_DUMP_INTR``. This is usually implemented by maintaining a generation id for the structure and recording it in the ``seq`` member of struct netlink_callback.”h]”(hŒyIf iterating over objects during dump may skip over objects or repeat them - make sure to report dump inconsistency with ”…””}”(hj3hžhhŸNh Nubj)”}”(hŒ``NLM_F_DUMP_INTR``”h]”hŒNLM_F_DUMP_INTR”…””}”(hj;hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj3ubhŒg. This is usually implemented by maintaining a generation id for the structure and recording it in the ”…””}”(hj3hžhhŸNh Nubj)”}”(hŒ``seq``”h]”hŒseq”…””}”(hjMhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj3ubhŒ# member of struct netlink_callback.”…””}”(hj3hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h K5hj"hžhubeh}”(h]”Œsupport-dump-consistency”ah ]”h"]”Œsupport dump consistency”ah$]”h&]”uh1hÂhh×hžhhŸh³h K3ubeh}”(h]”Œgeneral-guidance”ah ]”h"]”Œgeneral guidance”ah$]”h&]”uh1hÂhhÄhžhhŸh³h K ubhÃ)”}”(hhh]”(hÈ)”}”(hŒNetlink specification”h]”hŒNetlink specification”…””}”(hjxhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjuhžhhŸh³h K;ubhú)”}”(hŒ]Documentation of the Netlink specification parts which are only relevant to the kernel space.”h]”hŒ]Documentation of the Netlink specification parts which are only relevant to the kernel space.”…””}”(hj†hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h K=hjuhžhubhÃ)”}”(hhh]”(hÈ)”}”(hŒGlobals”h]”hŒGlobals”…””}”(hj—hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj”hžhhŸh³h KAubhÃ)”}”(hhh]”(hÈ)”}”(hŒ kernel-policy”h]”hŒ kernel-policy”…””}”(hj¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj¥hžhhŸh³h KDubhú)”}”(hXdDefines whether the kernel validation policy is ``global`` i.e. the same for all operations of the family, defined for each operation individually - ``per-op``, or separately for each operation and operation type (do vs dump) - ``split``. New families should use ``per-op`` (default) to be able to narrow down the attributes accepted by a specific command.”h]”(hŒ0Defines whether the kernel validation policy is ”…””}”(hj¶hžhhŸNh Nubj)”}”(hŒ ``global``”h]”hŒglobal”…””}”(hj¾hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¶ubhŒ[ i.e. the same for all operations of the family, defined for each operation individually - ”…””}”(hj¶hžhhŸNh Nubj)”}”(hŒ ``per-op``”h]”hŒper-op”…””}”(hjÐhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¶ubhŒE, or separately for each operation and operation type (do vs dump) - ”…””}”(hj¶hžhhŸNh Nubj)”}”(hŒ ``split``”h]”hŒsplit”…””}”(hjâhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¶ubhŒ. New families should use ”…””}”(hj¶hžhhŸNh Nubj)”}”(hŒ ``per-op``”h]”hŒper-op”…””}”(hjôhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¶ubhŒS (default) to be able to narrow down the attributes accepted by a specific command.”…””}”(hj¶hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h KFhj¥hžhubeh}”(h]”Œ kernel-policy”ah ]”h"]”Œ kernel-policy”ah$]”h&]”uh1hÂhj”hžhhŸh³h KDubeh}”(h]”Œglobals”ah ]”h"]”Œglobals”ah$]”h&]”uh1hÂhjuhžhhŸh³h KAubhÃ)”}”(hhh]”(hÈ)”}”(hŒchecks”h]”hŒchecks”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjhžhhŸh³h KMubhú)”}”(hŒADocumentation for the ``checks`` sub-sections of attribute specs.”h]”(hŒDocumentation for the ”…””}”(hj-hžhhŸNh Nubj)”}”(hŒ ``checks``”h]”hŒchecks”…””}”(hj5hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj-ubhŒ! sub-sections of attribute specs.”…””}”(hj-hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h KOhjhžhubhÃ)”}”(hhh]”(hÈ)”}”(hŒunterminated-ok”h]”hŒunterminated-ok”…””}”(hjPhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjMhžhhŸh³h KRubhú)”}”(hŒ‹Accept strings without the null-termination (for legacy families only). Switches from the ``NLA_NUL_STRING`` to ``NLA_STRING`` policy type.”h]”(hŒZAccept strings without the null-termination (for legacy families only). Switches from the ”…””}”(hj^hžhhŸNh Nubj)”}”(hŒ``NLA_NUL_STRING``”h]”hŒNLA_NUL_STRING”…””}”(hjfhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj^ubhŒ to ”…””}”(hj^hžhhŸNh Nubj)”}”(hŒ``NLA_STRING``”h]”hŒ NLA_STRING”…””}”(hjxhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj^ubhŒ policy type.”…””}”(hj^hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h KThjMhžhubeh}”(h]”Œunterminated-ok”ah ]”h"]”Œunterminated-ok”ah$]”h&]”uh1hÂhjhžhhŸh³h KRubhÃ)”}”(hhh]”(hÈ)”}”(hŒmax-len”h]”hŒmax-len”…””}”(hj›hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj˜hžhhŸh³h KXubhú)”}”(hŒÄDefines max length for a binary or string attribute (corresponding to the ``len`` member of struct nla_policy). For string attributes terminating null character is not counted towards ``max-len``.”h]”(hŒJDefines max length for a binary or string attribute (corresponding to the ”…””}”(hj©hžhhŸNh Nubj)”}”(hŒ``len``”h]”hŒlen”…””}”(hj±hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj©ubhŒg member of struct nla_policy). For string attributes terminating null character is not counted towards ”…””}”(hj©hžhhŸNh Nubj)”}”(hŒ ``max-len``”h]”hŒmax-len”…””}”(hjÃhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj©ubhŒ.”…””}”(hj©hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hùhŸh³h KZhj˜hžhubhú)”}”(hXThe field may either be a literal integer value or a name of a defined constant. String types may reduce the constant by one (i.e. specify ``max-len: CONST - 1``) to reserve space for the terminating character so implementations should recognize such pattern.”h]”(hŒ‹The field may either be a literal integer value or a name of a defined constant. 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