rtnetlink

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Version: 1999-05-14 (openSuse - 09/10/07)

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Section: 3 (Bibliothèques de fonctions)

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rtnetlink - rtnetlink ¥á¥Ã¥»¡¼¥¸¤òÁàºî¤¹¤ë¥Þ¥¯¥í

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#include <asm/types.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/socket.h>

rtnetlink_socket = socket(PF_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);

ÀâÌÀ

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RTA_DATA(rta) ¤Ï¤³¤Î°À­¥Ç¡¼¥¿¤ÎÀèƬ¤Ø¤Î¥Ý¥¤¥ó¥¿¤òÊÖ¤¹¡£
RTA_PAYLOAD(rta) ¤Ï¤³¤Î°À­¥Ç¡¼¥¿¤ÎŤµ¤òÊÖ¤¹¡£
RTA_NEXT(rta, attrlen) ¤Ï rta ¤Î¼¡¤Ë¤¢¤ë°À­¤ò¼èÆÀ¤¹¤ë¡£ ¤³¤Î¥Þ¥¯¥í¤ò¸Æ¤Ö¤È attrlen ¤¬¹¹¿·¤µ¤ì¤ë¡£ RTA_OK ¤ò»È¤Ã¤Æ¡¢ÊÖ¤µ¤ì¤¿¥Ý¥¤¥ó¥¿¤¬Àµ¤·¤¤¤«¤ò¥Á¥§¥Ã¥¯¤¹¤Ù¤­¤Ç¤¢¤ë¡£
RTA_LENGTH(len) ¤Ï len ¥Ð¥¤¥È¤Î¥Ç¡¼¥¿ + ¥Ø¥Ã¥À¤ËɬÍפÊŤµ¤òÊÖ¤¹¡£
RTA_SPACE(len) ¤Ï len ¥Ð¥¤¥È¤Î¥Ç¡¼¥¿¤ò»ý¤Ä¥á¥Ã¥»¡¼¥¸¤ËɬÍפȤµ¤ì¤ëÍÆÎ̤òÊÖ¤¹¡£

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¥Ç¥Ð¥¤¥¹¤Î MTU ¤ò¥»¥Ã¥È¤¹¤ë rtnetlink ¥á¥Ã¥»¡¼¥¸¤òÀ¸À®¤¹¤ë 

    struct {

        struct nlmsghdr  nh;

        struct ifinfomsg if;

        char             attrbuf[512];

    } req;



    struct rtattr *rta;

    unsigned int mtu = 1000;



    int rtnetlink_sk = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);



    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 = RTML_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(n->nlmsg_len));

    rta->rta_type = IFLA_MTU;

    rta->rta_len = sizeof(unsigned int);

    req.n.nlmsg_len = NLMSG_ALIGN(req.n.nlmsg_len) +

                                  RTA_LENGTH(sizeof(mtu));

    memcpy(RTA_DATA(rta), &mtu, sizeof(mtu));

    send(rtnetlink_sk, &req, req.n.nlmsg_len);

´ØÏ¢¹àÌÜ

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