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RTNETLINK |
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!!!RTNETLINK |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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EXAMPLE |
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BUGS |
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SEE ALSO |
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---- |
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!!NAME |
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rtnetlink - Macros to manipuate rtnetlink messages |
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!!SYNOPSIS |
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__#include __ |
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#include __ |
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#include __ |
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#include __ |
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__rtnetlink_socket = socket(PF_NETLINK, int__ |
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''socket_type''__, NETLINK_ROUTE); |
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int RTA_OK(struct rtattr *rta, int rtabuflen); |
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void *RTA_DATA(struct rtattr *rta); |
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unsigned int RTA_PAYLOAD(struct rtattr *rta); |
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struct rtattr *RTA_NEXT(struct rtattr *rta, unsigned int |
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rtabuflen); |
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unsigned int RTA_LENGTH(unsigned int length); |
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unsigned int RTA_SPACE(unsigned int |
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length);__ |
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!!DESCRIPTION |
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All rtnetlink(7) messages consist of a |
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netlink(7) message header and appended attributes. |
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The attributes should be only manipulated using the macros |
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provided here. |
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__RTA_OK(__''rta''__,__ ''attrlen''__)__ |
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returns true if ''rta'' points to a valid routing |
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attribute; ''attrlen'' is the running length of the |
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attribute buffer. When not true then you must assume there |
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are no more attributes in the message, even if |
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''attrlen'' is non-zero.__ |
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RTA_DATA(__''rta''__)__ returns a pointer to the |
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start of this attribute's data.__ |
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RTA_PAYLOAD(__''rta''__)__ returns the length of |
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this attribute's data.__ |
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RTA_NEXT(__''rta''__,__ ''attrlen''__)__ gets |
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the next attribute after ''rta''. Calling this macro will |
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update ''attrlen''. You should use __RTA_OK__ to check |
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for the validity of the returned pointer.__ |
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RTA_LENGTH(__''len''__)__ returns the length which |
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is required for ''len'' bytes of data plus the |
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header.__ |
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RTA_SPACE(__''len''__)__ returns the amount of space |
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which will be needed in the message with ''len'' bytes of |
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data. |
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!!EXAMPLE |
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Creating a rtnetlink message to set a MTU of a |
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device. |
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struct { |
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struct nlmsghdr nh; |
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struct ifinfomsg if; |
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char attrbuf[[512]; |
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} req; |
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struct rtattr *rta; |
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unsigned int mtu = 1000; |
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int rtnetlink_sk = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); |
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memset( |
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!!BUGS |
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This manual page is lacking and incomplete. |
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!!SEE ALSO |
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rtnetlink(7), netlink(7), |
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netlink(3) |
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---- |
