Modules
	Bonding

	Bridging

	CAN
	Controller Area Network link module.

	Dummy

	Link Modules API
	API for modules implementing specific link types/semantics.

	MACVLAN
	MAC-based Virtual LAN link module.

	VETH
	Virtual Ethernet.

	VLAN
	Virtual LAN link module.

	VXLAN
	Virtual eXtensible Local Area Network link module.

Data Structures
struct	rtnl_link
	Link object. More...

Enumerations
enum	rtnl_link_stat_id_t { RTNL_LINK_RX_PACKETS, RTNL_LINK_TX_PACKETS, RTNL_LINK_RX_BYTES, RTNL_LINK_TX_BYTES, RTNL_LINK_RX_ERRORS, RTNL_LINK_TX_ERRORS, RTNL_LINK_RX_DROPPED, RTNL_LINK_TX_DROPPED, RTNL_LINK_RX_COMPRESSED, RTNL_LINK_TX_COMPRESSED, RTNL_LINK_RX_FIFO_ERR, RTNL_LINK_TX_FIFO_ERR, RTNL_LINK_RX_LEN_ERR, RTNL_LINK_RX_OVER_ERR, RTNL_LINK_RX_CRC_ERR, RTNL_LINK_RX_FRAME_ERR, RTNL_LINK_RX_MISSED_ERR, RTNL_LINK_TX_ABORT_ERR, RTNL_LINK_TX_CARRIER_ERR, RTNL_LINK_TX_HBEAT_ERR, RTNL_LINK_TX_WIN_ERR, RTNL_LINK_COLLISIONS, RTNL_LINK_MULTICAST, RTNL_LINK_IP6_INPKTS, RTNL_LINK_IP6_INHDRERRORS, RTNL_LINK_IP6_INTOOBIGERRORS, RTNL_LINK_IP6_INNOROUTES, RTNL_LINK_IP6_INADDRERRORS, RTNL_LINK_IP6_INUNKNOWNPROTOS, RTNL_LINK_IP6_INTRUNCATEDPKTS, RTNL_LINK_IP6_INDISCARDS, RTNL_LINK_IP6_INDELIVERS, RTNL_LINK_IP6_OUTFORWDATAGRAMS, RTNL_LINK_IP6_OUTPKTS, RTNL_LINK_IP6_OUTDISCARDS, RTNL_LINK_IP6_OUTNOROUTES, RTNL_LINK_IP6_REASMTIMEOUT, RTNL_LINK_IP6_REASMREQDS, RTNL_LINK_IP6_REASMOKS, RTNL_LINK_IP6_REASMFAILS, RTNL_LINK_IP6_FRAGOKS, RTNL_LINK_IP6_FRAGFAILS, RTNL_LINK_IP6_FRAGCREATES, RTNL_LINK_IP6_INMCASTPKTS, RTNL_LINK_IP6_OUTMCASTPKTS, RTNL_LINK_IP6_INBCASTPKTS, RTNL_LINK_IP6_OUTBCASTPKTS, RTNL_LINK_IP6_INOCTETS, RTNL_LINK_IP6_OUTOCTETS, RTNL_LINK_IP6_INMCASTOCTETS, RTNL_LINK_IP6_OUTMCASTOCTETS, RTNL_LINK_IP6_INBCASTOCTETS, RTNL_LINK_IP6_OUTBCASTOCTETS, RTNL_LINK_ICMP6_INMSGS, RTNL_LINK_ICMP6_INERRORS, RTNL_LINK_ICMP6_OUTMSGS, RTNL_LINK_ICMP6_OUTERRORS, __RTNL_LINK_STATS_MAX }

Functions
int	rtnl_link_info_parse (struct rtnl_link link, struct nlattr *tb)

int	rtnl_link_fill_info (struct nl_msg msg, struct rtnl_link link)

Variables
struct nla_policy	rtln_link_policy [IFLA_MAX+1]

Get / List
int	rtnl_link_alloc_cache (struct nl_sock sk, int family, struct nl_cache *result)
	Allocate link cache and fill in all configured links. More...

struct rtnl_link *	rtnl_link_get (struct nl_cache *cache, int ifindex)
	Lookup link in cache by interface index. More...

struct rtnl_link *	rtnl_link_get_by_name (struct nl_cache cache, const char name)
	Lookup link in cache by link name. More...

int	rtnl_link_build_get_request (int ifindex, const char name, struct nl_msg *result)
	Construct RTM_GETLINK netlink message. More...

int	rtnl_link_get_kernel (struct nl_sock sk, int ifindex, const char name, struct rtnl_link **result)
	Get a link object directly from kernel. More...

char *	rtnl_link_i2name (struct nl_cache cache, int ifindex, char dst, size_t len)
	Translate interface index to corresponding link name. More...

int	rtnl_link_name2i (struct nl_cache cache, const char name)
	Translate link name to corresponding interface index. More...

Add / Modify
int	rtnl_link_build_add_request (struct rtnl_link link, int flags, struct nl_msg *result)
	Build a netlink message requesting the addition of new virtual link. More...

int	rtnl_link_add (struct nl_sock sk, struct rtnl_link link, int flags)
	Add virtual link. More...

int	rtnl_link_build_change_request (struct rtnl_link orig, struct rtnl_link changes, int flags, struct nl_msg **result)
	Build a netlink message requesting the modification of link. More...

int	rtnl_link_change (struct nl_sock sk, struct rtnl_link orig, struct rtnl_link *changes, int flags)
	Change link. More...

Delete
int	rtnl_link_build_delete_request (const struct rtnl_link link, struct nl_msg *result)
	Build a netlink message requesting the deletion of a link. More...

int	rtnl_link_delete (struct nl_sock sk, const struct rtnl_link link)
	Delete link. More...

Link Object
struct rtnl_link *	rtnl_link_alloc (void)
	Allocate link object. More...

void	rtnl_link_put (struct rtnl_link *link)
	Return a link object reference. More...

void	rtnl_link_set_name (struct rtnl_link link, const char name)
	Set name of link object. More...

char *	rtnl_link_get_name (struct rtnl_link *link)
	Return name of link object. More...

void	rtnl_link_set_group (struct rtnl_link *link, uint32_t group)
	Set the group identifier of a link object. More...

uint32_t	rtnl_link_get_group (struct rtnl_link *link)
	Return the group identifier of link object. More...

void	rtnl_link_set_addr (struct rtnl_link link, struct nl_addr addr)
	Set link layer address of link object. More...

struct nl_addr *	rtnl_link_get_addr (struct rtnl_link *link)
	Return link layer address of link object. More...

void	rtnl_link_set_broadcast (struct rtnl_link link, struct nl_addr addr)
	Set link layer broadcast address of link object. More...

struct nl_addr *	rtnl_link_get_broadcast (struct rtnl_link *link)
	Return link layer broadcast address of link object. More...

void	rtnl_link_set_flags (struct rtnl_link *link, unsigned int flags)
	Set flags of link object. More...

void	rtnl_link_unset_flags (struct rtnl_link *link, unsigned int flags)
	Unset flags of link object. More...

unsigned int	rtnl_link_get_flags (struct rtnl_link *link)
	Return flags of link object. More...

void	rtnl_link_set_family (struct rtnl_link *link, int family)
	Set address family of link object. More...

int	rtnl_link_get_family (struct rtnl_link *link)
	Return address family of link object. More...

void	rtnl_link_set_arptype (struct rtnl_link *link, unsigned int arptype)
	Set hardware type of link object. More...

unsigned int	rtnl_link_get_arptype (struct rtnl_link *link)
	Get hardware type of link object. More...

void	rtnl_link_set_ifindex (struct rtnl_link *link, int ifindex)
	Set interface index of link object. More...

int	rtnl_link_get_ifindex (struct rtnl_link *link)
	Return interface index of link object. More...

void	rtnl_link_set_mtu (struct rtnl_link *link, unsigned int mtu)
	Set Maximum Transmission Unit of link object. More...

unsigned int	rtnl_link_get_mtu (struct rtnl_link *link)
	Return maximum transmission unit of link object. More...

void	rtnl_link_set_txqlen (struct rtnl_link *link, unsigned int txqlen)
	Set transmission queue length. More...

unsigned int	rtnl_link_get_txqlen (struct rtnl_link *link)
	Return transmission queue length. More...

void	rtnl_link_set_link (struct rtnl_link *link, int ifindex)

int	rtnl_link_get_link (struct rtnl_link *link)

void	rtnl_link_set_master (struct rtnl_link *link, int ifindex)
	Set master link of link object. More...

int	rtnl_link_get_master (struct rtnl_link *link)
	Return master link of link object. More...

void	rtnl_link_set_carrier (struct rtnl_link *link, uint8_t status)
	Set carrier of link object. More...

uint8_t	rtnl_link_get_carrier (struct rtnl_link *link)
	Return carrier status of link object. More...

void	rtnl_link_set_operstate (struct rtnl_link *link, uint8_t status)
	Set operational status of link object. More...

uint8_t	rtnl_link_get_operstate (struct rtnl_link *link)
	Return operational status of link object. More...

void	rtnl_link_set_linkmode (struct rtnl_link *link, uint8_t mode)
	Set link mode of link object. More...

uint8_t	rtnl_link_get_linkmode (struct rtnl_link *link)
	Return link mode of link object. More...

const char *	rtnl_link_get_ifalias (struct rtnl_link *link)
	Return alias name of link object (SNMP IfAlias) More...

void	rtnl_link_set_ifalias (struct rtnl_link link, const char alias)
	Set alias name of link object (SNMP IfAlias) More...

void	rtnl_link_set_qdisc (struct rtnl_link link, const char name)
	Set queueing discipline name of link object. More...

char *	rtnl_link_get_qdisc (struct rtnl_link *link)
	Return name of queueing discipline of link object. More...

int	rtnl_link_get_num_vf (struct rtnl_link link, uint32_t num_vf)
	Return number of PCI virtual functions of link object. More...

uint64_t	rtnl_link_get_stat (struct rtnl_link *link, rtnl_link_stat_id_t id)
	Return value of link statistics counter. More...

int	rtnl_link_set_stat (struct rtnl_link *link, rtnl_link_stat_id_t id, const uint64_t value)
	Set value of link statistics counter. More...

int	rtnl_link_set_type (struct rtnl_link link, const char type)
	Set type of link object. More...

char *	rtnl_link_get_type (struct rtnl_link *link)
	Return type of link. More...

void	rtnl_link_set_promiscuity (struct rtnl_link *link, uint32_t count)
	Set link promiscuity count. More...

uint32_t	rtnl_link_get_promiscuity (struct rtnl_link *link)
	Return link promiscuity count. More...

void	rtnl_link_set_num_tx_queues (struct rtnl_link *link, uint32_t nqueues)
	Set number of TX queues. More...

uint32_t	rtnl_link_get_num_tx_queues (struct rtnl_link *link)
	Return number of TX queues. More...

void	rtnl_link_set_num_rx_queues (struct rtnl_link *link, uint32_t nqueues)
	Set number of RX queues. More...

uint32_t	rtnl_link_get_num_rx_queues (struct rtnl_link *link)
	Return number of RX queues. More...

struct nl_data *	rtnl_link_get_phys_port_id (struct rtnl_link *link)
	Return physical port id of link object. More...

void	rtnl_link_set_ns_fd (struct rtnl_link *link, int fd)

int	rtnl_link_get_ns_fd (struct rtnl_link *link)

void	rtnl_link_set_ns_pid (struct rtnl_link *link, pid_t pid)

pid_t	rtnl_link_get_ns_pid (struct rtnl_link *link)

Master/Slave
int	rtnl_link_enslave_ifindex (struct nl_sock *sock, int master, int slave)
	Enslave slave link to master link. More...

int	rtnl_link_enslave (struct nl_sock sock, struct rtnl_link master, struct rtnl_link *slave)
	Enslave slave link to master link. More...

int	rtnl_link_release_ifindex (struct nl_sock *sock, int slave)
	Release slave link from its master. More...

int	rtnl_link_release (struct nl_sock sock, struct rtnl_link slave)
	Release slave link from its master. More...

Utilities
char *	rtnl_link_flags2str (int flags, char *buf, size_t len)

int	rtnl_link_str2flags (const char *name)

char *	rtnl_link_stat2str (int st, char *buf, size_t len)

int	rtnl_link_str2stat (const char *name)

char *	rtnl_link_operstate2str (uint8_t st, char *buf, size_t len)

int	rtnl_link_str2operstate (const char *name)

char *	rtnl_link_mode2str (uint8_t st, char *buf, size_t len)

int	rtnl_link_str2mode (const char *name)

char *	rtnl_link_carrier2str (uint8_t st, char *buf, size_t len)

int	rtnl_link_str2carrier (const char *name)

Deprecated Functions
int	rtnl_link_set_info_type (struct rtnl_link link, const char type)

char *	rtnl_link_get_info_type (struct rtnl_link *link)

void	rtnl_link_set_weight (struct rtnl_link *link, unsigned int weight)

unsigned int	rtnl_link_get_weight (struct rtnl_link *link)

Detailed Description

Link Documentation (Netlink Routing Development Guide)

Enumeration Type Documentation

enum rtnl_link_stat_id_t

Enumerator
RTNL_LINK_RX_PACKETS	Packets received
RTNL_LINK_TX_PACKETS	Packets sent
RTNL_LINK_RX_BYTES	Bytes received
RTNL_LINK_TX_BYTES	Bytes sent
RTNL_LINK_RX_ERRORS	Receive errors
RTNL_LINK_TX_ERRORS	Send errors
RTNL_LINK_RX_DROPPED	Received packets dropped
RTNL_LINK_TX_DROPPED	Packets dropped during transmit
RTNL_LINK_RX_COMPRESSED	Compressed packets received
RTNL_LINK_TX_COMPRESSED	Compressed packets sent
RTNL_LINK_RX_FIFO_ERR	Receive FIFO errors
RTNL_LINK_TX_FIFO_ERR	Send FIFO errors
RTNL_LINK_RX_LEN_ERR	Length errors
RTNL_LINK_RX_OVER_ERR	Over errors
RTNL_LINK_RX_CRC_ERR	CRC errors
RTNL_LINK_RX_FRAME_ERR	Frame errors
RTNL_LINK_RX_MISSED_ERR	Missed errors
RTNL_LINK_TX_ABORT_ERR	Aborted errors
RTNL_LINK_TX_CARRIER_ERR	Carrier errors
RTNL_LINK_TX_HBEAT_ERR	Heartbeat errors
RTNL_LINK_TX_WIN_ERR	Window errors
RTNL_LINK_COLLISIONS	Send collisions
RTNL_LINK_MULTICAST	Multicast
RTNL_LINK_IP6_INPKTS	IPv6 SNMP InReceives
RTNL_LINK_IP6_INHDRERRORS	IPv6 SNMP InHdrErrors
RTNL_LINK_IP6_INTOOBIGERRORS	IPv6 SNMP InTooBigErrors
RTNL_LINK_IP6_INNOROUTES	IPv6 SNMP InNoRoutes
RTNL_LINK_IP6_INADDRERRORS	IPv6 SNMP InAddrErrors
RTNL_LINK_IP6_INUNKNOWNPROTOS	IPv6 SNMP InUnknownProtos
RTNL_LINK_IP6_INTRUNCATEDPKTS	IPv6 SNMP InTruncatedPkts
RTNL_LINK_IP6_INDISCARDS	IPv6 SNMP InDiscards
RTNL_LINK_IP6_INDELIVERS	IPv6 SNMP InDelivers
RTNL_LINK_IP6_OUTFORWDATAGRAMS	IPv6 SNMP OutForwDatagrams
RTNL_LINK_IP6_OUTPKTS	IPv6 SNMP OutRequests
RTNL_LINK_IP6_OUTDISCARDS	IPv6 SNMP OutDiscards
RTNL_LINK_IP6_OUTNOROUTES	IPv6 SNMP OutNoRoutes
RTNL_LINK_IP6_REASMTIMEOUT	IPv6 SNMP ReasmTimeout
RTNL_LINK_IP6_REASMREQDS	IPv6 SNMP ReasmReqds
RTNL_LINK_IP6_REASMOKS	IPv6 SNMP ReasmOKs
RTNL_LINK_IP6_REASMFAILS	IPv6 SNMP ReasmFails
RTNL_LINK_IP6_FRAGOKS	IPv6 SNMP FragOKs
RTNL_LINK_IP6_FRAGFAILS	IPv6 SNMP FragFails
RTNL_LINK_IP6_FRAGCREATES	IPv6 SNMP FragCreates
RTNL_LINK_IP6_INMCASTPKTS	IPv6 SNMP InMcastPkts
RTNL_LINK_IP6_OUTMCASTPKTS	IPv6 SNMP OutMcastPkts
RTNL_LINK_IP6_INBCASTPKTS	IPv6 SNMP InBcastPkts
RTNL_LINK_IP6_OUTBCASTPKTS	IPv6 SNMP OutBcastPkts
RTNL_LINK_IP6_INOCTETS	IPv6 SNMP InOctets
RTNL_LINK_IP6_OUTOCTETS	IPv6 SNMP OutOctets
RTNL_LINK_IP6_INMCASTOCTETS	IPv6 SNMP InMcastOctets
RTNL_LINK_IP6_OUTMCASTOCTETS	IPv6 SNMP OutMcastOctets
RTNL_LINK_IP6_INBCASTOCTETS	IPv6 SNMP InBcastOctets
RTNL_LINK_IP6_OUTBCASTOCTETS	IPv6 SNMP OutBcastOctets
RTNL_LINK_ICMP6_INMSGS	ICMPv6 SNMP InMsgs
RTNL_LINK_ICMP6_INERRORS	ICMPv6 SNMP InErrors
RTNL_LINK_ICMP6_OUTMSGS	ICMPv6 SNMP OutMsgs
RTNL_LINK_ICMP6_OUTERRORS	ICMPv6 SNMP OutErrors

Definition at line 38 of file link.h.

Function Documentation

int rtnl_link_alloc_cache	(	struct nl_sock *	sk,
		int	family,
		struct nl_cache **	result
	)

Allocate link cache and fill in all configured links.

Parameters

sk	Netlink socket.
family	Link address family or AF_UNSPEC
result	Pointer to store resulting cache.

Allocates and initializes a new link cache. A netlink message is sent to the kernel requesting a full dump of all configured links. The returned messages are parsed and filled into the cache. If the operation succeeds the resulting cache will a link object for each link configured in the kernel.

If family is set to an address family other than AF_UNSPEC the contents of the cache can be limited to a specific address family. Currently the following address families are supported:

AF_BRIDGE
AF_INET6

Get List of Links (Netlink Routing Development Guide)

See Also: rtnl_link_get(); rtnl_link_get_by_name()

Returns: 0 on success or a negative error code.

Definition at line 1017 of file link.c.

References nl_cache_alloc(), nl_cache_free(), and nl_cache_refill().

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struct rtnl_link* rtnl_link_get	(	struct nl_cache *	cache,
		int	ifindex
	)

read

Lookup link in cache by interface index.

Parameters

cache	Link cache
ifindex	Interface index

Searches through the provided cache looking for a link with matching interface index.

Attention: The reference counter of the returned link object will be incremented. Use rtnl_link_put() to release the reference.

Get List of Links (Netlink Routing Development Guide)

See Also: rtnl_link_get_by_name()

Returns: Link object or NULL if no match was found.

Definition at line 1052 of file link.c.

References nl_object_get().

Referenced by rtnl_link_i2name().

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struct rtnl_link* rtnl_link_get_by_name	(	struct nl_cache *	cache,
		const char *	name
	)

read

Lookup link in cache by link name.

Parameters

cache	Link cache
name	Name of link

Searches through the provided cache looking for a link with matching link name

Attention: The reference counter of the returned link object will be incremented. Use rtnl_link_put() to release the reference.

Get List of Links (Netlink Routing Development Guide)

See Also: rtnl_link_get()

Returns: Link object or NULL if no match was found.

Definition at line 1084 of file link.c.

References nl_object_get().

Referenced by rtnl_link_name2i().

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int rtnl_link_build_get_request	(	int	ifindex,
		const char *	name,
		struct nl_msg **	result
	)

Construct RTM_GETLINK netlink message.

Parameters

ifindex	Interface index
name	Name of link
result	Pointer to store resulting netlink message

The behaviour of this function is identical to rtnl_link_get_kernel() with the exception that it will not send the message but return it in the provided return pointer instead.

See Also: rtnl_link_get_kernel()

Returns: 0 on success or a negative error code.

Definition at line 1116 of file link.c.

References NLA_PUT_STRING, nlmsg_alloc_simple(), nlmsg_append(), and nlmsg_free().

Referenced by rtnl_link_get_kernel().

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int rtnl_link_get_kernel	(	struct nl_sock *	sk,
		int	ifindex,
		const char *	name,
		struct rtnl_link **	result
	)

Get a link object directly from kernel.

Parameters

sk	Netlink socket
ifindex	Interface index
name	Name of link
result	Pointer to store resulting link object

This function builds a RTM_GETLINK netlink message to request a specific link directly from the kernel. The returned answer is parsed into a struct rtnl_link object and returned via the result pointer or -NLE_OBJ_NOTFOUND is returned if no matching link was found.

Lookup Single Link (Direct Lookup) (Netlink Routing Development Guide)

Returns: 0 on success or a negative error code.

Definition at line 1165 of file link.c.

References nl_pickup(), nl_send_auto(), nlmsg_free(), and rtnl_link_build_get_request().

Referenced by rtnl_link_bond_enslave_ifindex(), and rtnl_link_enslave_ifindex().

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char* rtnl_link_i2name	(	struct nl_cache *	cache,
		int	ifindex,
		char *	dst,
		size_t	len
	)

Translate interface index to corresponding link name.

Parameters

cache	Link cache
ifindex	Interface index
dst	String to store name
len	Length of destination string

Translates the specified interface index to the corresponding link name and stores the name in the destination string.

Translating interface index to link name (Netlink Routing Development Guide)

See Also: rtnl_link_name2i()

Returns: Name of link or NULL if no match was found.

Definition at line 1207 of file link.c.

References rtnl_link_get(), and rtnl_link_put().

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int rtnl_link_name2i	(	struct nl_cache *	cache,
		const char *	name
	)

Translate link name to corresponding interface index.

Parameters

cache	Link cache
name	Name of link

Translating interface index to link name (Netlink Routing Development Guide)

See Also: rtnl_link_i2name()

Returns: Interface index or 0 if no match was found.

Definition at line 1230 of file link.c.

References rtnl_link_get_by_name(), and rtnl_link_put().

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int rtnl_link_build_add_request	(	struct rtnl_link *	link,
		int	flags,
		struct nl_msg **	result
	)

Build a netlink message requesting the addition of new virtual link.

Parameters

link	new link to add
flags	additional netlink message flags
result	pointer to store resulting netlink message

The behaviour of this function is identical to rtnl_link_add() with the exception that it will not send the message but return it in the provided return pointer instead.

See Also: rtnl_link_add()

Note: This operation is not supported on all kernel versions.

Returns: 0 on success or a negative error code.

Definition at line 1375 of file link.c.

Referenced by rtnl_link_add().

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int rtnl_link_add	(	struct nl_sock *	sk,
		struct rtnl_link *	link,
		int	flags
	)

Add virtual link.

Parameters

sk	netlink socket.
link	new link to add
flags	additional netlink message flags

Builds a RTM_NEWLINK netlink message requesting the addition of a new virtual link.

After sending, the function will wait for the ACK or an eventual error message to be received and will therefore block until the operation has been completed.

Definition at line 1404 of file link.c.

References nl_send_sync(), and rtnl_link_build_add_request().

Referenced by rtnl_link_bond_add(), rtnl_link_bridge_add(), and rtnl_link_veth_add().

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int rtnl_link_build_change_request	(	struct rtnl_link *	orig,
		struct rtnl_link *	changes,
		int	flags,
		struct nl_msg **	result
	)

Build a netlink message requesting the modification of link.

Parameters

orig	original link to change
changes	link containing the changes to be made
flags	additional netlink message flags
result	pointer to store resulting netlink message

The behaviour of this function is identical to rtnl_link_change() with the exception that it will not send the message but return it in the provided return pointer instead.

See Also: rtnl_link_change()

Note: The resulting message will have message type set to RTM_NEWLINK which may not work with older kernels. You may have to modify it to RTM_SETLINK (does not allow changing link info attributes) to have the change request work with older kernels.

Returns: 0 on success or a negative error code.

Definition at line 1436 of file link.c.

Referenced by rtnl_link_change().

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int rtnl_link_change	(	struct nl_sock *	sk,
		struct rtnl_link *	orig,
		struct rtnl_link *	changes,
		int	flags
	)

Change link.

Parameters

sk	netlink socket.
orig	original link to be changed
changes	link containing the changes to be made
flags	additional netlink message flags

Builds a RTM_NEWLINK netlink message requesting the change of a network link. If -EOPNOTSUPP is returned by the kernel, the message type will be changed to RTM_SETLINK and the message is resent to work around older kernel versions.

The link to be changed is looked up based on the interface index supplied in the orig link. Optionaly the link name is used but only if no interface index is provided, otherwise providing an link name will result in the link name being changed.

If no matching link exists, the function will return -NLE_OBJ_NOTFOUND.

After sending, the function will wait for the ACK or an eventual error message to be received and will therefore block until the operation has been completed.

Definition at line 1503 of file link.c.

References nl_send_auto_complete(), nlmsg_free(), and rtnl_link_build_change_request().

Referenced by rtnl_link_bond_enslave_ifindex(), and rtnl_link_enslave_ifindex().

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int rtnl_link_build_delete_request	(	const struct rtnl_link *	link,
		struct nl_msg **	result
	)

Build a netlink message requesting the deletion of a link.

Parameters

link	Link to delete
result	Pointer to store resulting netlink message

The behaviour of this function is identical to rtnl_link_delete() with the exception that it will not send the message but return it in the provided return pointer instead.

See Also: rtnl_link_delete()

Returns: 0 on success or a negative error code.

Definition at line 1549 of file link.c.

References NLA_PUT_STRING, nlmsg_alloc_simple(), nlmsg_append(), and nlmsg_free().

Referenced by rtnl_link_delete().

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int rtnl_link_delete	(	struct nl_sock *	sk,
		const struct rtnl_link *	link
	)

Delete link.

Parameters

sk	Netlink socket
link	Link to delete

Builds a RTM_DELLINK netlink message requesting the deletion of a network link which has been previously added to the kernel and sends the message to the kernel.

If no matching link exists, the function will return -NLE_OBJ_NOTFOUND.

After sending, the function will wait for the ACK or an eventual error message to be received and will therefore block until the operation has been completed.

Definition at line 1603 of file link.c.

References nl_send_sync(), and rtnl_link_build_delete_request().

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struct rtnl_link* rtnl_link_alloc ( void )

read

Allocate link object.

See Also: rtnl_link_put()

Returns: New link object or NULL if allocation failed

Definition at line 1627 of file link.c.

References nl_object_alloc().

Referenced by rtnl_link_bond_alloc(), rtnl_link_bridge_alloc(), rtnl_link_enslave_ifindex(), rtnl_link_macvlan_alloc(), rtnl_link_veth_alloc(), rtnl_link_vlan_alloc(), and rtnl_link_vxlan_alloc().

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void rtnl_link_put ( struct rtnl_link * link )

Return a link object reference.

Parameters

link	Link object

Definition at line 1636 of file link.c.

References nl_object_put().

Referenced by rtnl_link_bond_add(), rtnl_link_bond_alloc(), rtnl_link_bond_enslave_ifindex(), rtnl_link_bridge_add(), rtnl_link_bridge_alloc(), rtnl_link_enslave_ifindex(), rtnl_link_i2name(), rtnl_link_macvlan_alloc(), rtnl_link_name2i(), rtnl_link_veth_add(), rtnl_link_veth_alloc(), rtnl_link_veth_release(), rtnl_link_vlan_alloc(), rtnl_link_vxlan_alloc(), rtnl_tc_set_ifindex(), and rtnl_tc_set_link().

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void rtnl_link_set_name	(	struct rtnl_link *	link,
		const char *	name
	)

Set name of link object.

Parameters

link	Link object
name	New name

Note: To change the name of a link in the kernel, set the interface index to the link you wish to change, modify the link name using this function and pass the link object to rtnl_link_change() or rtnl_link_add().

Link Name (Netlink Routing Development Guide)

See Also: rtnl_link_get_name(); rtnl_link_set_ifindex()

Definition at line 1655 of file link.c.

Referenced by rtnl_link_bond_add(), rtnl_link_bridge_add(), and rtnl_link_veth_add().

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char* rtnl_link_get_name ( struct rtnl_link * link )

Return name of link object.

Parameters

link	Link object

Link Name (Netlink Routing Development Guide)

See Also: rtnl_link_set_name()

Returns: Link name or NULL if name is not specified

Definition at line 1669 of file link.c.

Referenced by rtnl_link_bond_add().

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void rtnl_link_set_group	(	struct rtnl_link *	link,
		uint32_t	group
	)

Set the group identifier of a link object.

Parameters

link	Link object
group	Group identifier

Definition at line 1679 of file link.c.

uint32_t rtnl_link_get_group ( struct rtnl_link * link )

Return the group identifier of link object.

Parameters

link	Link object

Returns: Group identifier or 0 if not set.

Definition at line 1691 of file link.c.

void rtnl_link_set_addr	(	struct rtnl_link *	link,
		struct nl_addr *	addr
	)

Set link layer address of link object.

Parameters

link	Link object
addr	New link layer address

The function increments the reference counter of the address object and overwrites any existing link layer address previously assigned.

Link layer address (Netlink Routing Development Guide)

See Also: rtnl_link_get_addr()

Definition at line 1719 of file link.c.

struct nl_addr* rtnl_link_get_addr ( struct rtnl_link * link )

read

Return link layer address of link object.

Parameters

link	Link object

Definition at line 1733 of file link.c.

void rtnl_link_set_broadcast	(	struct rtnl_link *	link,
		struct nl_addr *	addr
	)

Set link layer broadcast address of link object.

Parameters

link	Link object
addr	New broadcast address

The function increments the reference counter of the address object and overwrites any existing link layer broadcast address previously assigned.

Link Layer Broadcast Address (Netlink Routing Development Guide)

See Also: rtnl_link_get_broadcast()

Definition at line 1750 of file link.c.

struct nl_addr* rtnl_link_get_broadcast ( struct rtnl_link * link )

read

Return link layer broadcast address of link object.

Parameters

link	Link object

Definition at line 1764 of file link.c.

void rtnl_link_set_flags	(	struct rtnl_link *	link,
		unsigned int	flags
	)

Set flags of link object.

Parameters

link	Link object
flags	Flags

See Also: rtnl_link_get_flags(); rtnl_link_unset_flags()

Definition at line 1777 of file link.c.

void rtnl_link_unset_flags	(	struct rtnl_link *	link,
		unsigned int	flags
	)

Unset flags of link object.

Parameters

link	Link object
flags	Flags

See Also: rtnl_link_set_flags(); rtnl_link_get_flags()

Definition at line 1792 of file link.c.

unsigned int rtnl_link_get_flags ( struct rtnl_link * link )

Return flags of link object.

Parameters

link	Link object

Link Flags (Netlink Routing Development Guide)

See Also: rtnl_link_set_flags(); rtnl_link_unset_flags()

Returns: Link flags or 0 if none have been set.

Definition at line 1808 of file link.c.

void rtnl_link_set_family	(	struct rtnl_link *	link,
		int	family
	)

Set address family of link object.

See Also: rtnl_link_get_family()

Definition at line 1818 of file link.c.

int rtnl_link_get_family ( struct rtnl_link * link )

Return address family of link object.

Parameters

link	Link object

See Also: rtnl_link_set_family()

Returns: Address family or AF_UNSPEC if not specified.

Definition at line 1839 of file link.c.

void rtnl_link_set_arptype	(	struct rtnl_link *	link,
		unsigned int	arptype
	)

Set hardware type of link object.

Parameters

link	Link object
arptype	New hardware type (ARPHRD_*)

Hardware Type (Netlink Routing Development Guide)

Definition at line 1853 of file link.c.

unsigned int rtnl_link_get_arptype ( struct rtnl_link * link )

Get hardware type of link object.

Parameters

link	Link object

Hardware Type (Netlink Routing Development Guide)

See Also: rtnl_link_set_arptype()

Returns: Hardware type (ARPHRD_ETHER *) or ARPHRD_VOID

Definition at line 1867 of file link.c.

void rtnl_link_set_ifindex	(	struct rtnl_link *	link,
		int	ifindex
	)

Set interface index of link object.

Parameters

link	Link object
ifindex	Interface index

Interface Index (Netlink Routing Development Guide)

See Also: rtnl_link_get_ifindex()

Definition at line 1883 of file link.c.

Referenced by rtnl_link_bond_enslave_ifindex(), and rtnl_link_enslave_ifindex().

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int rtnl_link_get_ifindex ( struct rtnl_link * link )

Return interface index of link object.

Parameters

link	Link object

Interface Index (Netlink Routing Development Guide)

See Also: rtnl_link_set_ifindex()

Returns: Interface index or 0 if not set.

Definition at line 1898 of file link.c.

Referenced by rtnl_link_bond_enslave(), rtnl_link_bond_release(), rtnl_link_enslave(), and rtnl_link_release().

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void rtnl_link_set_mtu	(	struct rtnl_link *	link,
		unsigned int	mtu
	)

Set Maximum Transmission Unit of link object.

Parameters

link	Link object
mtu	New MTU value in number of bytes

Maximum Transmission Unit (Netlink Routing Development Guide)

See Also: rtnl_link_get_mtu()

Definition at line 1911 of file link.c.

unsigned int rtnl_link_get_mtu ( struct rtnl_link * link )

Return maximum transmission unit of link object.

Parameters

link	Link object

Maximum Transmission Unit (Netlink Routing Development Guide)

See Also: rtnl_link_set_mtu()

Returns: MTU in bytes or 0 if not set

Definition at line 1925 of file link.c.

void rtnl_link_set_txqlen	(	struct rtnl_link *	link,
		unsigned int	txqlen
	)

Set transmission queue length.

Parameters

link	Link object
txqlen	New queue length

The unit is dependant on the link type. The most common units is number of packets.

Transmission Queue Length (Netlink Routing Development Guide)

Definition at line 1940 of file link.c.

unsigned int rtnl_link_get_txqlen ( struct rtnl_link * link )

Return transmission queue length.

Parameters

link	Link object

The unit is dependant on the link type. The most common units is number of packets.

Transmission Queue Length (Netlink Routing Development Guide)

Returns: queue length or 0 if not specified.

Definition at line 1956 of file link.c.

void rtnl_link_set_master	(	struct rtnl_link *	link,
		int	ifindex
	)

Set master link of link object.

Parameters

link	Link object
ifindex	Interface index of master link

See Also: rtnl_link_get_master()

Definition at line 1979 of file link.c.

Referenced by rtnl_link_bond_enslave_ifindex(), and rtnl_link_enslave_ifindex().

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int rtnl_link_get_master ( struct rtnl_link * link )

Return master link of link object.

Parameters

link	Link object

See Also: rtnl_link_set_master()

Returns: Interface index of master link or 0 if not specified

Definition at line 1992 of file link.c.

Referenced by rtnl_link_bond_enslave_ifindex(), and rtnl_link_enslave_ifindex().

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void rtnl_link_set_carrier	(	struct rtnl_link *	link,
		uint8_t	status
	)

Set carrier of link object.

Parameters

link	Link object
status	New carrier status

See Also: rtnl_link_get_carrier()

Definition at line 2004 of file link.c.

uint8_t rtnl_link_get_carrier ( struct rtnl_link * link )

Return carrier status of link object.

Parameters

link	Link object

See Also: rtnl_link_set_master()

Returns: Carrier state.

Definition at line 2017 of file link.c.

void rtnl_link_set_operstate	(	struct rtnl_link *	link,
		uint8_t	status
	)

Set operational status of link object.

Parameters

link	Link object
status	New opertional status

Operational Status (Netlink Routing Development Guide)}

See Also: rtnl_link_get_operstate()

Definition at line 2030 of file link.c.

uint8_t rtnl_link_get_operstate ( struct rtnl_link * link )

Return operational status of link object.

Parameters

link	Link object

Operational Status (Netlink Routing Development Guide)

See Also: rtnl_link_set_operstate()

Returns: Opertional state or IF_OPER_UNKNOWN

Definition at line 2044 of file link.c.

void rtnl_link_set_linkmode	(	struct rtnl_link *	link,
		uint8_t	mode
	)

Set link mode of link object.

Parameters

link	Link object
mode	New link mode

Mode (Netlink Routing Development Guide)

See Also: rtnl_link_get_linkmode()

Definition at line 2057 of file link.c.

uint8_t rtnl_link_get_linkmode ( struct rtnl_link * link )

Return link mode of link object.

Parameters

link	Link object

Mode (Netlink Routing Development Guide)

See Also: rtnl_link_get_linkmode()

Returns: Link mode or IF_LINK_MODE_DEFAULT

Definition at line 2071 of file link.c.

const char* rtnl_link_get_ifalias ( struct rtnl_link * link )

Return alias name of link object (SNMP IfAlias)

Parameters

link	Link object

Alias (Netlink Routing Development Guide)

See Also: rtnl_link_set_ifalias()

Returns: Alias name or NULL if not set.

Definition at line 2084 of file link.c.

void rtnl_link_set_ifalias	(	struct rtnl_link *	link,
		const char *	alias
	)

Set alias name of link object (SNMP IfAlias)

Parameters

link	Link object
alias	Alias name or NULL to unset

Sets the alias name of the link to the specified name. The alias name can be unset by specyfing NULL as the alias. The name will be strdup()ed, so no need to provide a persistent character string.

Alias (Netlink Routing Development Guide)

See Also: rtnl_link_get_ifalias()

Definition at line 2101 of file link.c.

void rtnl_link_set_qdisc	(	struct rtnl_link *	link,
		const char *	name
	)

Set queueing discipline name of link object.

Parameters

link	Link object
name	Name of queueing discipline

Definition at line 2125 of file link.c.

char* rtnl_link_get_qdisc ( struct rtnl_link * link )

Return name of queueing discipline of link object.

Parameters

link	Link object

Queueing Discipline Name (Netlink Routing Development Guide)

See Also: rtnl_link_set_qdisc()

Returns: Name of qdisc or NULL if not specified.

Definition at line 2139 of file link.c.

int rtnl_link_get_num_vf	(	struct rtnl_link *	link,
		uint32_t *	num_vf
	)

Return number of PCI virtual functions of link object.

Parameters

link	Link object
num_vf	Pointer to store number of VFs

Returns: 0 on success or -NLE_OPNOTSUPP if not available

Definition at line 2152 of file link.c.

uint64_t rtnl_link_get_stat	(	struct rtnl_link *	link,
		rtnl_link_stat_id_t	id
	)

Return value of link statistics counter.

Parameters

link	Link object
id	Identifier of statistical counter

Returns: Value of counter or 0 if not specified.

Definition at line 2168 of file link.c.

int rtnl_link_set_stat	(	struct rtnl_link *	link,
		rtnl_link_stat_id_t	id,
		const uint64_t	value
	)

Set value of link statistics counter.

Parameters

link	Link object
id	Identifier of statistical counter
value	New value

Note: Changing the value of a statistical counter will not change the value in the kernel.

Returns: 0 on success or a negative error code

Definition at line 2187 of file link.c.

int rtnl_link_set_type	(	struct rtnl_link *	link,
		const char *	type
	)

Set type of link object.

Parameters

link	Link object
type	Name of link type

Looks up the link type module and prepares the link to store type specific attributes. If a type has been assigned already it will be released with all link type specific attributes lost.

Link Modules (Netlink Routing Development Guide)

Returns: 0 on success or a negative errror code.

Definition at line 2210 of file link.c.

References rtnl_link_info_ops_lookup().

Referenced by rtnl_link_bond_alloc(), rtnl_link_bridge_alloc(), rtnl_link_macvlan_alloc(), rtnl_link_set_info_type(), rtnl_link_veth_alloc(), rtnl_link_vlan_alloc(), and rtnl_link_vxlan_alloc().

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char* rtnl_link_get_type ( struct rtnl_link * link )

Return type of link.

Parameters

link	Link object

Link Modules (Netlink Routing Development Guide)

Returns: Name of link type or NULL if not specified.

Definition at line 2253 of file link.c.

Referenced by rtnl_link_get_info_type().

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void rtnl_link_set_promiscuity	(	struct rtnl_link *	link,
		uint32_t	count
	)

Set link promiscuity count.

Parameters

link	Link object
count	New promiscuity count

Definition at line 2267 of file link.c.

uint32_t rtnl_link_get_promiscuity ( struct rtnl_link * link )

Return link promiscuity count.

Parameters

link	Link object

See Also: rtnl_link_set_promiscuity()

Returns: Link promiscuity count or 0

Definition at line 2280 of file link.c.

void rtnl_link_set_num_tx_queues	(	struct rtnl_link *	link,
		uint32_t	nqueues
	)

Set number of TX queues.

Parameters

link	Link object
nqueues	Number of queues

Sets the number of TX queues of the link object. The value is considered by the kernel when creating network devices that can be created via netlink. The value will be passed on to alloc_netdev_mqs()

Therefore use of rtnl_link_set_num_tx_queues() only makes sense in combination with rtnl_link_add() or if the link object is used as a filter.

See Also: rtnl_link_get_num_tx_queues()

Definition at line 2299 of file link.c.

uint32_t rtnl_link_get_num_tx_queues ( struct rtnl_link * link )

Return number of TX queues.

Parameters

link	Link object

Returns: Number of TX queues or 0

Definition at line 2311 of file link.c.

void rtnl_link_set_num_rx_queues	(	struct rtnl_link *	link,
		uint32_t	nqueues
	)

Set number of RX queues.

Parameters

link	Link object
nqueues	Number of queues

Sets the number of RX queues of the link object. The value is considered by the kernel when creating network devices that can be created via netlink. The value will be passed on to alloc_netdev_mqs()

Therefore use of rtnl_link_set_num_rx_queues() only makes sense in combination with rtnl_link_add() or if the link object is used as a filter.

See Also: rtnl_link_get_num_rx_queues()

Definition at line 2330 of file link.c.

uint32_t rtnl_link_get_num_rx_queues ( struct rtnl_link * link )

Return number of RX queues.

Parameters

link	Link object

Returns: Number of RX queues or 0

Definition at line 2342 of file link.c.

struct nl_data* rtnl_link_get_phys_port_id ( struct rtnl_link * link )

read

Return physical port id of link object.

Parameters

link	Link object

Returns: Physical port id or NULL if not set.

Definition at line 2353 of file link.c.

int rtnl_link_enslave_ifindex	(	struct nl_sock *	sock,
		int	master,
		int	slave
	)

Enslave slave link to master link.

Parameters

sock	netlink socket
master	ifindex of master link
slave	ifindex of slave link

This function is identical to rtnl_link_enslave() except that it takes interface indices instead of rtnl_link objects.

See Also: rtnl_link_enslave()

Returns: 0 on success or a negative error code.

Definition at line 2400 of file link.c.

References rtnl_link_alloc(), rtnl_link_change(), rtnl_link_get_kernel(), rtnl_link_get_master(), rtnl_link_put(), rtnl_link_set_ifindex(), and rtnl_link_set_master().

Referenced by rtnl_link_enslave(), and rtnl_link_release_ifindex().

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int rtnl_link_enslave	(	struct nl_sock *	sock,
		struct rtnl_link *	master,
		struct rtnl_link *	slave
	)

Enslave slave link to master link.

Parameters

sock	netlink socket
master	master link
slave	slave link

Constructs a RTM_NEWLINK or RTM_SETLINK message adding the slave to the master and sends the request via the specified netlink socket.

Note: The feature of enslaving/releasing via netlink has only been added recently to the kernel (Feb 2011). Also, the kernel does not signal if the operation is not supported. Therefore this function will verify if the master assignment has changed and will return -NLE_OPNOTSUPP if it did not.

See Also: rtnl_link_enslave_ifindex(); rtnl_link_release()

Returns: 0 on success or a negative error code.

Definition at line 2455 of file link.c.

References rtnl_link_enslave_ifindex(), and rtnl_link_get_ifindex().

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int rtnl_link_release_ifindex	(	struct nl_sock *	sock,
		int	slave
	)

Release slave link from its master.

Parameters

sock	netlink socket
slave	slave link

This function is identical to rtnl_link_release() except that it takes an interface index instead of a rtnl_link object.

See Also: rtnl_link_release()

Returns: 0 on success or a negative error code.

Definition at line 2474 of file link.c.

References rtnl_link_enslave_ifindex().

Referenced by rtnl_link_release().

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int rtnl_link_release	(	struct nl_sock *	sock,
		struct rtnl_link *	slave
	)

Release slave link from its master.

Parameters

sock	netlink socket
slave	slave link

Constructs a RTM_NEWLINK or RTM_SETLINK message releasing the slave from its master and sends the request via the specified netlink socket.

Note: The feature of enslaving/releasing via netlink has only been added recently to the kernel (Feb 2011). Also, the kernel does not signal if the operation is not supported. Therefore this function will verify if the master assignment has changed and will return -NLE_OPNOTSUPP if it did not.

See Also: rtnl_link_release_ifindex(); rtnl_link_enslave()

Returns: 0 on success or a negative error code.

Definition at line 2498 of file link.c.

References rtnl_link_get_ifindex(), and rtnl_link_release_ifindex().

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int rtnl_link_set_info_type	(	struct rtnl_link *	link,
		const char *	type
	)

Deprecated:: Use of this function is deprecated, use rtnl_link_set_type()

Definition at line 2675 of file link.c.

References rtnl_link_set_type().

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char* rtnl_link_get_info_type ( struct rtnl_link * link )

Deprecated:: Use of this function is deprecated, use rtnl_link_get_type()

Definition at line 2683 of file link.c.

References rtnl_link_get_type().

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void rtnl_link_set_weight	(	struct rtnl_link *	link,
		unsigned int	weight
	)

Deprecated:: The weight attribute is unused and obsoleted in all recent kernels

Definition at line 2691 of file link.c.

unsigned int rtnl_link_get_weight ( struct rtnl_link * link )

Deprecated:: The weight attribute is unused and obsoleted in all recent kernels

Definition at line 2700 of file link.c.

Variable Documentation

struct nla_policy rtln_link_policy[IFLA_MAX+1]

Initial value:

= {
        [IFLA_IFNAME]           = { .type = NLA_STRING,
                                    .maxlen = IFNAMSIZ },
        [IFLA_MTU]              = { .type = NLA_U32 },
        [IFLA_TXQLEN]           = { .type = NLA_U32 },
        [IFLA_LINK]             = { .type = NLA_U32 },
        [IFLA_WEIGHT]           = { .type = NLA_U32 },
        [IFLA_MASTER]           = { .type = NLA_U32 },
        [IFLA_OPERSTATE]        = { .type = NLA_U8 },
        [IFLA_LINKMODE]         = { .type = NLA_U8 },
        [IFLA_LINKINFO]         = { .type = NLA_NESTED },
        [IFLA_QDISC]            = { .type = NLA_STRING,
                                    .maxlen = IFQDISCSIZ },
        [IFLA_STATS]            = { .minlen = sizeof(struct rtnl_link_stats) },
        [IFLA_STATS64]          = { .minlen = sizeof(struct rtnl_link_stats64)},
        [IFLA_MAP]              = { .minlen = sizeof(struct rtnl_link_ifmap) },
        [IFLA_IFALIAS]          = { .type = NLA_STRING, .maxlen = IFALIASZ },
        [IFLA_NUM_VF]           = { .type = NLA_U32 },
        [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
        [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
        [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
        [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
        [IFLA_GROUP]            = { .type = NLA_U32 },
        [IFLA_CARRIER]          = { .type = NLA_U8 },
        [IFLA_PHYS_PORT_ID]     = { .type = NLA_UNSPEC },
        [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
        [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
}

Definition at line 265 of file link.c.

Modules

Data Structures

Enumerations

Functions

Variables

Get / List

Add / Modify

Delete

Link Object

Master/Slave

Utilities

Deprecated Functions

Detailed Description

Enumeration Type Documentation

Function Documentation

Variable Documentation