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    The following form allows you to view linux man pages.

    Command:

    rtnetlink

    
    
    

    SYNOPSIS

           #include <asm/types.h>
           #include <linux/netlink.h>
           #include <linux/rtnetlink.h>
           #include <sys/socket.h>
    
           rtnetlink_socket = socket(AF_NETLINK, int socket_type, NETLINK_ROUTE);
    
           int RTA_OK(struct rtattr *rta, int rtabuflen);
    
           void *RTA_DATA(struct rtattr *rta);
    
           unsigned int RTA_PAYLOAD(struct rtattr *rta);
    
           struct rtattr *RTA_NEXT(struct rtattr *rta, unsigned int rtabuflen);
    
           unsigned int RTA_LENGTH(unsigned int length);
    
           unsigned int RTA_SPACE(unsigned int length);
    
    
    

    DESCRIPTION

           All  rtnetlink(7)  messages  consist of a netlink(7) message header and
           appended attributes.  The attributes should be manipulated  only  using
           the macros provided here.
    
           RTA_OK(rta,  attrlen)  returns  true  if  rta points to a valid routing
           attribute; attrlen is the running length of the attribute buffer.  When
           not  true then you must assume there are no more attributes in the mes-
           sage, even if attrlen is nonzero.
    
           RTA_DATA(rta) returns a pointer to the start of this attribute's  data.
    
           RTA_PAYLOAD(rta) returns the length of this attribute's data.
    
           RTA_NEXT(rta, attrlen) gets the next attribute after rta.  Calling this
           macro will update attrlen.  You should use RTA_OK to check the validity
           of the returned pointer.
    
           RTA_LENGTH(len)  returns  the length which is required for len bytes of
           data plus the header.
    
           RTA_SPACE(len) returns the amount of space which will be  needed  in  a
           message with len bytes of data.
    
    
    

    CONFORMING TO

           These macros are nonstandard Linux extensions.
    
    
    

    BUGS

           This manual page is incomplete.
    
    
    

    EXAMPLE

           Creating a rtnetlink message to set the MTU of a device:
    
               memset(&req, 0, sizeof(req));
               req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
               req.nh.nlmsg_flags = NLM_F_REQUEST;
               req.nh.nlmsg_type = RTM_NEWLINK;
               req.if.ifi_family = AF_UNSPEC;
               req.if.ifi_index = INTERFACE_INDEX;
               req.if.ifi_change = 0xffffffff; /* ??? */
               rta = (struct rtattr *)(((char *) &req) +
                                        NLMSG_ALIGN(req.nh.nlmsg_len));
               rta->rta_type = IFLA_MTU;
               rta->rta_len = RTA_LENGTH(sizeof(unsigned int));
               req.n.nlmsg_len = NLMSG_ALIGN(req.nh.nlmsg_len) +
                                             RTA_LENGTH(sizeof(mtu));
               memcpy(RTA_DATA(rta), &mtu, sizeof(mtu));
               send(rtnetlink_sk, &req, req.nh.nlmsg_len);
    
    
    

    SEE ALSO

           netlink(3), netlink(7), rtnetlink(7)
    
    
    

    GNU 2012-03-24 RTNETLINK(3)

    
    
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