€•ŽqŒsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œtranslations”Œ LanguagesNode”“”)”}”(hhh]”(hŒpending_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/networking/operstates”Œmodname”NŒ classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/zh_TW/networking/operstates”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/it_IT/networking/operstates”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/ja_JP/networking/operstates”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/ko_KR/networking/operstates”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/sp_SP/networking/operstates”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ SPDX-License-Identifier: GPL-2.0”h]”hŒ SPDX-License-Identifier: GPL-2.0”…””}”hh£sbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1h¡hhhžhhŸŒC/var/lib/git/docbuild/linux/Documentation/networking/operstates.rst”h KubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒOperational States”h]”hŒOperational States”…””}”(hh»hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hh¶hžhhŸh³h Kubhµ)”}”(hhh]”(hº)”}”(hŒ1. Introduction”h]”hŒ1. Introduction”…””}”(hhÌhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hhÉhžhhŸh³h K ubhŒ paragraph”“”)”}”(hŒæLinux distinguishes between administrative and operational state of an interface. Administrative state is the result of "ip link set dev up or down" and reflects whether the administrator wants to use the device for traffic.”h]”hŒêLinux distinguishes between administrative and operational state of an interface. Administrative state is the result of â€œip link set dev up or downâ€ and reflects whether the administrator wants to use the device for traffic.”…””}”(hhÜhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KhhÉhžhubhÛ)”}”(hXUHowever, an interface is not usable just because the admin enabled it - ethernet requires to be plugged into the switch and, depending on a site's networking policy and configuration, an 802.1X authentication to be performed before user data can be transferred. Operational state shows the ability of an interface to transmit this user data.”h]”hXWHowever, an interface is not usable just because the admin enabled it - ethernet requires to be plugged into the switch and, depending on a siteâ€™s networking policy and configuration, an 802.1X authentication to be performed before user data can be transferred. Operational state shows the ability of an interface to transmit this user data.”…””}”(hhêhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KhhÉhžhubhÛ)”}”(hXGThanks to 802.1X, userspace must be granted the possibility to influence operational state. To accommodate this, operational state is split into two parts: Two flags that can be set by the driver only, and a RFC2863 compatible state that is derived from these flags, a policy, and changeable from userspace under certain rules.”h]”hXGThanks to 802.1X, userspace must be granted the possibility to influence operational state. To accommodate this, operational state is split into two parts: Two flags that can be set by the driver only, and a RFC2863 compatible state that is derived from these flags, a policy, and changeable from userspace under certain rules.”…””}”(hhøhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KhhÉhžhubeh}”(h]”Œintroduction”ah ]”h"]”Œ1. introduction”ah$]”h&]”uh1h´hh¶hžhhŸh³h K ubhµ)”}”(hhh]”(hº)”}”(hŒ2. Querying from userspace”h]”hŒ2. Querying from userspace”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hjhžhhŸh³h KubhÛ)”}”(hŒðBoth admin and operational state can be queried via the netlink operation RTM_GETLINK. It is also possible to subscribe to RTNLGRP_LINK to be notified of updates while the interface is admin up. This is important for setting from userspace.”h]”hŒðBoth admin and operational state can be queried via the netlink operation RTM_GETLINK. It is also possible to subscribe to RTNLGRP_LINK to be notified of updates while the interface is admin up. This is important for setting from userspace.”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K hjhžhubhÛ)”}”(hŒ%These values contain interface state:”h]”hŒ%These values contain interface state:”…””}”(hj-hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K%hjhžhubhŒdefinition_list”“”)”}”(hhh]”(hŒdefinition_list_item”“”)”}”(hŒ4ifinfomsg::if_flags & IFF_UP: Interface is admin up ”h]”(hŒterm”“”)”}”(hŒifinfomsg::if_flags & IFF_UP:”h]”hŒifinfomsg::if_flags & IFF_UP:”…””}”(hjHhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h K(hjBubhŒ definition”“”)”}”(hhh]”hÛ)”}”(hŒInterface is admin up”h]”hŒInterface is admin up”…””}”(hj[hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K(hjXubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjBubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h K(hj=ubjA)”}”(hŒäifinfomsg::if_flags & IFF_RUNNING: Interface is in RFC2863 operational state UP or UNKNOWN. This is for backward compatibility, routing daemons, dhcp clients can use this flag to determine whether they should use the interface. ”h]”(jG)”}”(hŒ"ifinfomsg::if_flags & IFF_RUNNING:”h]”hŒ"ifinfomsg::if_flags & IFF_RUNNING:”…””}”(hjyhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h K-hjuubjW)”}”(hhh]”hÛ)”}”(hŒÀInterface is in RFC2863 operational state UP or UNKNOWN. This is for backward compatibility, routing daemons, dhcp clients can use this flag to determine whether they should use the interface.”h]”hŒÀInterface is in RFC2863 operational state UP or UNKNOWN. This is for backward compatibility, routing daemons, dhcp clients can use this flag to determine whether they should use the interface.”…””}”(hjŠhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K+hj‡ubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjuubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h K-hj=hžhubjA)”}”(hŒKifinfomsg::if_flags & IFF_LOWER_UP: Driver has signaled netif_carrier_on() ”h]”(jG)”}”(hŒ#ifinfomsg::if_flags & IFF_LOWER_UP:”h]”hŒ#ifinfomsg::if_flags & IFF_LOWER_UP:”…””}”(hj¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h K0hj¤ubjW)”}”(hhh]”hÛ)”}”(hŒ&Driver has signaled netif_carrier_on()”h]”hŒ&Driver has signaled netif_carrier_on()”…””}”(hj¹hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K0hj¶ubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhj¤ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h K0hj=hžhubjA)”}”(hŒJifinfomsg::if_flags & IFF_DORMANT: Driver has signaled netif_dormant_on() ”h]”(jG)”}”(hŒ"ifinfomsg::if_flags & IFF_DORMANT:”h]”hŒ"ifinfomsg::if_flags & IFF_DORMANT:”…””}”(hj×hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h K3hjÓubjW)”}”(hhh]”hÛ)”}”(hŒ&Driver has signaled netif_dormant_on()”h]”hŒ&Driver has signaled netif_dormant_on()”…””}”(hjèhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K3hjåubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjÓubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h K3hj=hžhubeh}”(h]”h ]”h"]”h$]”h&]”uh1j;hjhžhhŸh³h Nubhµ)”}”(hhh]”(hº)”}”(hŒTLV IFLA_OPERSTATE”h]”hŒTLV IFLA_OPERSTATE”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hjhžhhŸh³h K6ubhÛ)”}”(hŒBcontains RFC2863 state of the interface in numeric representation:”h]”hŒBcontains RFC2863 state of the interface in numeric representation:”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K8hjhžhubj<)”}”(hhh]”(jA)”}”(hŒÞIF_OPER_UNKNOWN (0): Interface is in unknown state, neither driver nor userspace has set operational state. Interface must be considered for user data as setting operational state has not been implemented in every driver. ”h]”(jG)”}”(hŒIF_OPER_UNKNOWN (0):”h]”hŒIF_OPER_UNKNOWN (0):”…””}”(hj.hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h K=hj*ubjW)”}”(hhh]”hÛ)”}”(hŒÈInterface is in unknown state, neither driver nor userspace has set operational state. Interface must be considered for user data as setting operational state has not been implemented in every driver.”h]”hŒÈInterface is in unknown state, neither driver nor userspace has set operational state. Interface must be considered for user data as setting operational state has not been implemented in every driver.”…””}”(hj?hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K;hj<ubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhj*ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h K=hj'ubjA)”}”(hŒ{IF_OPER_NOTPRESENT (1): Unused in current kernel (notpresent interfaces normally disappear), just a numerical placeholder. ”h]”(jG)”}”(hŒIF_OPER_NOTPRESENT (1):”h]”hŒIF_OPER_NOTPRESENT (1):”…””}”(hj]hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h KAhjYubjW)”}”(hhh]”hÛ)”}”(hŒbUnused in current kernel (notpresent interfaces normally disappear), just a numerical placeholder.”h]”hŒbUnused in current kernel (notpresent interfaces normally disappear), just a numerical placeholder.”…””}”(hjnhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K@hjkubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjYubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h KAhj'hžhubjA)”}”(hŒwIF_OPER_DOWN (2): Interface is unable to transfer data on L1, f.e. ethernet is not plugged or interface is ADMIN down. ”h]”(jG)”}”(hŒIF_OPER_DOWN (2):”h]”hŒIF_OPER_DOWN (2):”…””}”(hjŒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h KEhjˆubjW)”}”(hhh]”hÛ)”}”(hŒdInterface is unable to transfer data on L1, f.e. ethernet is not plugged or interface is ADMIN down.”h]”hŒdInterface is unable to transfer data on L1, f.e. ethernet is not plugged or interface is ADMIN down.”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KDhjšubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjˆubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h KEhj'hžhubjA)”}”(hŒqIF_OPER_LOWERLAYERDOWN (3): Interfaces stacked on an interface that is IF_OPER_DOWN show this state (f.e. VLAN). ”h]”(jG)”}”(hŒIF_OPER_LOWERLAYERDOWN (3):”h]”hŒIF_OPER_LOWERLAYERDOWN (3):”…””}”(hj»hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h KIhj·ubjW)”}”(hhh]”hÛ)”}”(hŒTInterfaces stacked on an interface that is IF_OPER_DOWN show this state (f.e. VLAN).”h]”hŒTInterfaces stacked on an interface that is IF_OPER_DOWN show this state (f.e. VLAN).”…””}”(hjÌhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KHhjÉubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhj·ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h KIhj'hžhubjA)”}”(hŒ¬IF_OPER_TESTING (4): Interface is in testing mode, for example executing driver self-tests or media (cable) test. It can't be used for normal traffic until tests complete. ”h]”(jG)”}”(hŒIF_OPER_TESTING (4):”h]”hŒIF_OPER_TESTING (4):”…””}”(hjêhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h KNhjæubjW)”}”(hhh]”hÛ)”}”(hŒ–Interface is in testing mode, for example executing driver self-tests or media (cable) test. It can't be used for normal traffic until tests complete.”h]”hŒ˜Interface is in testing mode, for example executing driver self-tests or media (cable) test. It canâ€™t be used for normal traffic until tests complete.”…””}”(hjûhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KLhjøubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjæubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h KNhj'hžhubjA)”}”(hŒwIF_OPER_DORMANT (5): Interface is L1 up, but waiting for an external event, f.e. for a protocol to establish. (802.1X) ”h]”(jG)”}”(hŒIF_OPER_DORMANT (5):”h]”hŒIF_OPER_DORMANT (5):”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h KRhjubjW)”}”(hhh]”hÛ)”}”(hŒaInterface is L1 up, but waiting for an external event, f.e. for a protocol to establish. (802.1X)”h]”hŒaInterface is L1 up, but waiting for an external event, f.e. for a protocol to establish. (802.1X)”…””}”(hj*hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KQhj'ubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h KRhj'hžhubjA)”}”(hŒ=IF_OPER_UP (6): Interface is operational up and can be used. ”h]”(jG)”}”(hŒIF_OPER_UP (6):”h]”hŒIF_OPER_UP (6):”…””}”(hjHhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h KUhjDubjW)”}”(hhh]”hÛ)”}”(hŒ,Interface is operational up and can be used.”h]”hŒ,Interface is operational up and can be used.”…””}”(hjYhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KUhjVubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjDubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h KUhj'hžhubeh}”(h]”h ]”h"]”h$]”h&]”uh1j;hjhžhhŸh³h NubhÛ)”}”(hŒ'This TLV can also be queried via sysfs.”h]”hŒ'This TLV can also be queried via sysfs.”…””}”(hjyhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KWhjhžhubeh}”(h]”Œtlv-ifla-operstate”ah ]”h"]”Œtlv ifla_operstate”ah$]”h&]”uh1h´hjhžhhŸh³h K6ubhµ)”}”(hhh]”(hº)”}”(hŒTLV IFLA_LINKMODE”h]”hŒTLV IFLA_LINKMODE”…””}”(hj’hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hjhžhhŸh³h KZubhÛ)”}”(hŒOcontains link policy. This is needed for userspace interaction described below.”h]”hŒOcontains link policy. This is needed for userspace interaction described below.”…””}”(hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K\hjhžhubhÛ)”}”(hŒ'This TLV can also be queried via sysfs.”h]”hŒ'This TLV can also be queried via sysfs.”…””}”(hj®hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K_hjhžhubeh}”(h]”Œtlv-ifla-linkmode”ah ]”h"]”Œtlv ifla_linkmode”ah$]”h&]”uh1h´hjhžhhŸh³h KZubeh}”(h]”Œquerying-from-userspace”ah ]”h"]”Œ2. querying from userspace”ah$]”h&]”uh1h´hh¶hžhhŸh³h Kubhµ)”}”(hhh]”(hº)”}”(hŒ3. Kernel driver API”h]”hŒ3. Kernel driver API”…””}”(hjÏhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hjÌhžhhŸh³h KcubhÛ)”}”(hXBKernel drivers have access to two flags that map to IFF_LOWER_UP and IFF_DORMANT. These flags can be set from everywhere, even from interrupts. It is guaranteed that only the driver has write access, however, if different layers of the driver manipulate the same flag, the driver has to provide the synchronisation needed.”h]”hXBKernel drivers have access to two flags that map to IFF_LOWER_UP and IFF_DORMANT. These flags can be set from everywhere, even from interrupts. It is guaranteed that only the driver has write access, however, if different layers of the driver manipulate the same flag, the driver has to provide the synchronisation needed.”…””}”(hjÝhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KehjÌhžhubhÛ)”}”(hŒ.__LINK_STATE_NOCARRIER, maps to !IFF_LOWER_UP:”h]”hŒ.__LINK_STATE_NOCARRIER, maps to !IFF_LOWER_UP:”…””}”(hjëhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KkhjÌhžhubhÛ)”}”(hŒãThe driver uses netif_carrier_on() to clear and netif_carrier_off() to set this flag. On netif_carrier_off(), the scheduler stops sending packets. The name 'carrier' and the inversion are historical, think of it as lower layer.”h]”hŒçThe driver uses netif_carrier_on() to clear and netif_carrier_off() to set this flag. On netif_carrier_off(), the scheduler stops sending packets. The name â€˜carrierâ€™ and the inversion are historical, think of it as lower layer.”…””}”(hjùhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KmhjÌhžhubhÛ)”}”(hŒ¯Note that for certain kind of soft-devices, which are not managing any real hardware, it is possible to set this bit from userspace. One should use TLV IFLA_CARRIER to do so.”h]”hŒ¯Note that for certain kind of soft-devices, which are not managing any real hardware, it is possible to set this bit from userspace. One should use TLV IFLA_CARRIER to do so.”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KrhjÌhžhubhÛ)”}”(hŒ1netif_carrier_ok() can be used to query that bit.”h]”hŒ1netif_carrier_ok() can be used to query that bit.”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KvhjÌhžhubhÛ)”}”(hŒ*__LINK_STATE_DORMANT, maps to IFF_DORMANT:”h]”hŒ*__LINK_STATE_DORMANT, maps to IFF_DORMANT:”…””}”(hj#hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KxhjÌhžhubhÛ)”}”(hXSet by the driver to express that the device cannot yet be used because some driver controlled protocol establishment has to complete. Corresponding functions are netif_dormant_on() to set the flag, netif_dormant_off() to clear it and netif_dormant() to query.”h]”hXSet by the driver to express that the device cannot yet be used because some driver controlled protocol establishment has to complete. Corresponding functions are netif_dormant_on() to set the flag, netif_dormant_off() to clear it and netif_dormant() to query.”…””}”(hj1hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KzhjÌhžhubhÛ)”}”(hŒ®On device allocation, both flags __LINK_STATE_NOCARRIER and __LINK_STATE_DORMANT are cleared, so the effective state is equivalent to netif_carrier_ok() and !netif_dormant().”h]”hŒ®On device allocation, both flags __LINK_STATE_NOCARRIER and __LINK_STATE_DORMANT are cleared, so the effective state is equivalent to netif_carrier_ok() and !netif_dormant().”…””}”(hj?hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KhjÌhžhubhÛ)”}”(hŒŽWhenever the driver CHANGES one of these flags, a workqueue event is scheduled to translate the flag combination to IFLA_OPERSTATE as follows:”h]”hŒŽWhenever the driver CHANGES one of these flags, a workqueue event is scheduled to translate the flag combination to IFLA_OPERSTATE as follows:”…””}”(hjMhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K„hjÌhžhubj<)”}”(hhh]”(jA)”}”(hŒª!netif_carrier_ok(): IF_OPER_LOWERLAYERDOWN if the interface is stacked, IF_OPER_DOWN otherwise. Kernel can recognise stacked interfaces because their ifindex != iflink. ”h]”(jG)”}”(hŒ!netif_carrier_ok():”h]”hŒ!netif_carrier_ok():”…””}”(hjbhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h K‹hj^ubjW)”}”(hhh]”hÛ)”}”(hŒ”IF_OPER_LOWERLAYERDOWN if the interface is stacked, IF_OPER_DOWN otherwise. Kernel can recognise stacked interfaces because their ifindex != iflink.”h]”hŒ”IF_OPER_LOWERLAYERDOWN if the interface is stacked, IF_OPER_DOWN otherwise. Kernel can recognise stacked interfaces because their ifindex != iflink.”…””}”(hjshžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K‰hjpubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhj^ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h K‹hj[ubjA)”}”(hŒ7netif_carrier_ok() && netif_dormant(): IF_OPER_DORMANT ”h]”(jG)”}”(hŒ&netif_carrier_ok() && netif_dormant():”h]”hŒ&netif_carrier_ok() && netif_dormant():”…””}”(hj‘hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h KŽhjubjW)”}”(hhh]”hÛ)”}”(hŒIF_OPER_DORMANT”h]”hŒIF_OPER_DORMANT”…””}”(hj¢hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KŽhjŸubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h KŽhj[hžhubjA)”}”(hŒÉnetif_carrier_ok() && !netif_dormant(): IF_OPER_UP if userspace interaction is disabled. Otherwise IF_OPER_DORMANT with the possibility for userspace to initiate the IF_OPER_UP transition afterwards. ”h]”(jG)”}”(hŒ'netif_carrier_ok() && !netif_dormant():”h]”hŒ'netif_carrier_ok() && !netif_dormant():”…””}”(hjÀhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jFhŸh³h K”hj¼ubjW)”}”(hhh]”hÛ)”}”(hŒŸIF_OPER_UP if userspace interaction is disabled. Otherwise IF_OPER_DORMANT with the possibility for userspace to initiate the IF_OPER_UP transition afterwards.”h]”hŒŸIF_OPER_UP if userspace interaction is disabled. Otherwise IF_OPER_DORMANT with the possibility for userspace to initiate the IF_OPER_UP transition afterwards.”…””}”(hjÑhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K‘hjÎubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhj¼ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j@hŸh³h K”hj[hžhubeh}”(h]”h ]”h"]”h$]”h&]”uh1j;hjÌhžhhŸh³h Nubeh}”(h]”Œkernel-driver-api”ah ]”h"]”Œ3. kernel driver api”ah$]”h&]”uh1h´hh¶hžhhŸh³h Kcubhµ)”}”(hhh]”(hº)”}”(hŒ4. Setting from userspace”h]”hŒ4. Setting from userspace”…””}”(hjühžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hjùhžhhŸh³h K—ubhÛ)”}”(hX:Applications have to use the netlink interface to influence the RFC2863 operational state of an interface. Setting IFLA_LINKMODE to 1 via RTM_SETLINK instructs the kernel that an interface should go to IF_OPER_DORMANT instead of IF_OPER_UP when the combination netif_carrier_ok() && !netif_dormant() is set by the driver. Afterwards, the userspace application can set IFLA_OPERSTATE to IF_OPER_DORMANT or IF_OPER_UP as long as the driver does not set netif_carrier_off() or netif_dormant_on(). Changes made by userspace are multicasted on the netlink group RTNLGRP_LINK.”h]”hX:Applications have to use the netlink interface to influence the RFC2863 operational state of an interface. Setting IFLA_LINKMODE to 1 via RTM_SETLINK instructs the kernel that an interface should go to IF_OPER_DORMANT instead of IF_OPER_UP when the combination netif_carrier_ok() && !netif_dormant() is set by the driver. Afterwards, the userspace application can set IFLA_OPERSTATE to IF_OPER_DORMANT or IF_OPER_UP as long as the driver does not set netif_carrier_off() or netif_dormant_on(). Changes made by userspace are multicasted on the netlink group RTNLGRP_LINK.”…””}”(hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K™hjùhžhubhÛ)”}”(hŒESo basically a 802.1X supplicant interacts with the kernel like this:”h]”hŒESo basically a 802.1X supplicant interacts with the kernel like this:”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K£hjùhžhubhŒbullet_list”“”)”}”(hhh]”(hŒ list_item”“”)”}”(hŒsubscribe to RTNLGRP_LINK”h]”hÛ)”}”(hj/h]”hŒsubscribe to RTNLGRP_LINK”…””}”(hj1hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K¥hj-ubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubj,)”}”(hŒ&set IFLA_LINKMODE to 1 via RTM_SETLINK”h]”hÛ)”}”(hjFh]”hŒ&set IFLA_LINKMODE to 1 via RTM_SETLINK”…””}”(hjHhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K¦hjDubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubj,)”}”(hŒ+query RTM_GETLINK once to get initial state”h]”hÛ)”}”(hj]h]”hŒ+query RTM_GETLINK once to get initial state”…””}”(hj_hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K§hj[ubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubj,)”}”(hŒhif initial flags are not (IFF_LOWER_UP && !IFF_DORMANT), wait until netlink multicast signals this state”h]”hÛ)”}”(hŒhif initial flags are not (IFF_LOWER_UP && !IFF_DORMANT), wait until netlink multicast signals this state”h]”hŒhif initial flags are not (IFF_LOWER_UP && !IFF_DORMANT), wait until netlink multicast signals this state”…””}”(hjvhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K¨hjrubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubj,)”}”(hŒ2do 802.1X, eventually abort if flags go down again”h]”hÛ)”}”(hjŒh]”hŒ2do 802.1X, eventually abort if flags go down again”…””}”(hjŽhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KªhjŠubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubj,)”}”(hŒesend RTM_SETLINK to set operstate to IF_OPER_UP if authentication succeeds, IF_OPER_DORMANT otherwise”h]”hÛ)”}”(hŒesend RTM_SETLINK to set operstate to IF_OPER_UP if authentication succeeds, IF_OPER_DORMANT otherwise”h]”hŒesend RTM_SETLINK to set operstate to IF_OPER_UP if authentication succeeds, IF_OPER_DORMANT otherwise”…””}”(hj¥hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K«hj¡ubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubj,)”}”(hŒAsee how operstate and IFF_RUNNING is echoed via netlink multicast”h]”hÛ)”}”(hj»h]”hŒAsee how operstate and IFF_RUNNING is echoed via netlink multicast”…””}”(hj½hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h Khj¹ubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubj,)”}”(hŒFset interface back to IF_OPER_DORMANT if 802.1X reauthentication fails”h]”hÛ)”}”(hŒFset interface back to IF_OPER_DORMANT if 802.1X reauthentication fails”h]”hŒFset interface back to IF_OPER_DORMANT if 802.1X reauthentication fails”…””}”(hjÔhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K®hjÐubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubj,)”}”(hŒ;restart if kernel changes IFF_LOWER_UP or IFF_DORMANT flag ”h]”hÛ)”}”(hŒ:restart if kernel changes IFF_LOWER_UP or IFF_DORMANT flag”h]”hŒ:restart if kernel changes IFF_LOWER_UP or IFF_DORMANT flag”…””}”(hjìhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K°hjèubah}”(h]”h ]”h"]”h$]”h&]”uh1j+hj(hžhhŸh³h Nubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1j&hŸh³h K¥hjùhžhubhÛ)”}”(hŒZif supplicant goes down, bring back IFLA_LINKMODE to 0 and IFLA_OPERSTATE to a sane value.”h]”hŒZif supplicant goes down, bring back IFLA_LINKMODE to 0 and IFLA_OPERSTATE to a sane value.”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h K²hjùhžhubhÛ)”}”(hŒ¸A routing daemon or dhcp client just needs to care for IFF_RUNNING or waiting for operstate to go IF_OPER_UP/IF_OPER_UNKNOWN before considering the interface / querying a DHCP address.”h]”hŒ¸A routing daemon or dhcp client just needs to care for IFF_RUNNING or waiting for operstate to go IF_OPER_UP/IF_OPER_UNKNOWN before considering the interface / querying a DHCP address.”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h KµhjùhžhubhÛ)”}”(hŒ\For technical questions and/or comments please e-mail to Stefan Rompf (stefan at loplof.de).”h]”hŒ\For technical questions and/or comments please e-mail to Stefan Rompf (stefan at loplof.de).”…””}”(hj$hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÚhŸh³h Kºhjùhžhubeh}”(h]”Œsetting-from-userspace”ah ]”h"]”Œ4. setting from userspace”ah$]”h&]”uh1h´hh¶hžhhŸh³h K—ubeh}”(h]”Œoperational-states”ah ]”h"]”Œoperational states”ah$]”h&]”uh1h´hhhžhhŸh³h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h³uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¹NŒ generator”NŒ datestamp”NŒsource_link”NŒ source_url”NŒ toc_backlinks”Œentry”Œfootnote_backlinks”KŒ sectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒ strip_classes”NŒreport_level”KŒ halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ traceback”ˆŒinput_encoding”Œ utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”jeŒerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œ language_code”Œen”Œrecord_dependencies”NŒconfig”NŒ id_prefix”hŒauto_id_prefix”Œid”Œ dump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”h³Œ_destination”NŒ _config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒfile_insertion_enabled”ˆŒraw_enabled”KŒline_length_limit”M'Œpep_references”NŒpep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒrfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ tab_width”KŒtrim_footnote_reference_space”‰Œsyntax_highlight”Œlong”Œsmart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œ docinfo_xform”KŒsectsubtitle_xform”‰Œ image_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”Œnameids”}”(j?j<jjjÉjÆjŒj‰jÁj¾jöjój7j4uŒ nametypes”}”(j?‰j‰jÉ‰jŒ‰jÁ‰jö‰j7‰uh}”(j<h¶jhÉjÆjj‰jj¾jjójÌj4jùuŒ footnote_refs”}”Œ citation_refs”}”Œ autofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ footnotes”]”Œ citations”]”Œautofootnote_start”KŒsymbol_footnote_start”KŒ id_counter”Œcollections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œtransformer”NŒinclude_log”]”Œ decoration”Nhžhub.