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libnetlink(3) | Library Functions Manual | libnetlink(3) |
NAME¶
libnetlink - A library for accessing the netlink serviceSYNOPSIS¶
#include <asm/types.h>#include <libnetlink.h>#include <linux/netlink.h>#include <linux/rtnetlink.h>int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)int rtnl_send(struct rtnl_handle *rth, char *buf, int len)int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)int rtnl_dump_filter(struct rtnl_handle *rth, int (*filter)(struct sockaddr_nl *, struct nlmsghdr *n, void *), void *arg1, int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *), void *arg2)int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer, unsigned groups, struct nlmsghdr *answer,int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),void *jarg)int rtnl_listen(struct rtnl_handle *rtnl, int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *), void *jarg)int rtnl_from_file(FILE *rtnl, int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *), void *jarg)int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen)int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)int rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen)
DESCRIPTION¶
libnetlink provides a higher level interface to rtnetlink(7). The read functions return 0 on success and a negative errno on failure. The send functions return the amount of data sent, or -1 on error.- rtnl_open
- Open a rtnetlink socket and save the state into the
rth handle. This handle is passed to all subsequent calls.
subscriptions is a bitmap of the rtnetlink multicast groups the
socket will be a member of.
- rtnl_wilddump_request
- Request a full dump of the type database for
family addresses. type is a rtnetlink message type.
- rtnl_dump_request
- Request a full dump of the type data buffer into
buf with maximum length of len. type is a rtnetlink
message type.
- rtnl_dump_filter
- Receive netlink data after a request and filter it. The
filter callback checks if the received message is wanted. It gets
the source address of the message, the message itself and arg1 as
arguments. 0 as return means that the filter passed, a negative value is
returned by rtnl_dump_filter in case of error. NULL for
filter means to not use a filter. junk is used to filter
messages not destined to the local socket. Only one message bundle is
received. Unless there is no message pending, this function does not
block.
- rtnl_listen
- Receive netlink data after a request and pass it to
handler. handler is a callback that gets the message source
address, the message itself, and the jarg cookie as arguments. It
will get called for all received messages. Only one message bundle is
received. Unless there is no message pending this function does not block.
- rtnl_from_file
- Works like rtnl_listen, but reads a netlink message bundle from the file file and passes the messages to handler for parsing. The file contains raw data as received from a rtnetlink socket.
- rtnl_send
- Send the rtnetlink message in buf of length
len to handle rth.
- addattr32
- Add a __u32 attribute of type type and with value
data to netlink message n, which is part of a buffer of
length maxlen.
- addattr_l
- Add a variable length attribute of type type and
with value data and alen length to netlink message n,
which is part of a buffer of length maxlen. data is copied.
- rta_addattr32
- Initialize the rtnetlink attribute rta with a __u32
data value.
- rta_addattr32
- Initialize the rtnetlink attribute rta with a
variable length data value.