netlink求救！(页 1) - C/C++ (STL/boost) - Linux伊甸园论坛

liwang820716 发表于 2007-4-26 16:52

netlink求救！

用netlink读取内核路由表并显示出来的时候，读到的metric的值总是为零，不知道为什么，请各位大侠指点。具体的函数片断如下：-j4J+D P*_1[

struct route* get_route(struct nlmsghdr *nlmsghdr)!^q2Fma[d+G;q
{
      struct rtattr *rta;
      int len;
6CKs8mZIK/b0^
      struct route *route;
      if ((route = malloc(sizeof(struct route))) == NULL)
      {:h.x8N9t @
#ifdef DEBUG_NETLINK3v`#Vo}Zv
            perror("Insufficient memory allocating route error!"[IMG]http://www.linuxc.net/images/smilies/wink.gif[/IMG];
#endif
            return NULL;)TM8qv&H k)rA
      })O\.@$}0B5fbYe4|
       FED9Dd(C)f,IY
      memset(route, 0, sizeof(struct route));

      len = nlmsghdr->nlmsg_len - NLMSG_LENGTH(sizeof(struct rtmsg));
BOwa/b!Vg
      /** NLMSG_DATA(nlmsghdr) return the rtmsg pointer following, and RTM_RTA return MM?1A@^
            the rtattr pointer following the rtmsg.       **//P0J#`ah/p
      rta = RTM_RTA(NLMSG_DATA(nlmsghdr));+P0pmv)\ n-Dd
      while (RTA_OK(rta, len))
      {
            if (rta->rta_type >= RTA_MAX)7h|UeMz
            {
                     break;}H`#KK7Yio
            }XFd`[

            /** get the dst address **/
            if(rta->rta_type == RTA_DST)(uJs*c9U!^ \+q-w
            {8VwAgA3T
                     route->dst = *(struct in_addr *)(RTA_DATA(rta));W-o$Z$JP
            }"Q X"jgl(] RFL

            /** get the nexthop address **/9ef+]uE
            if(rta->rta_type == RTA_GATEWAY)
            {
                     route->nexthop = *(struct in_addr *)(RTA_DATA(rta));
            }
            ~ `(nTfKk
            /** get the metric **/
            if(rta->rta_type == RTA_METRICS)8ENN1IkkW
            {9Un)WC$ZU6H
                     route->metric = *(int *)RTA_DATA(rta);
            }

            rta = RTA_NEXT(rta, len);
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      }d-{[)d$V#Qb
      return route;CP7L/~{[!Q
}
:V@h1juqjW
小弟感激不尽！

flag 发表于 2007-4-30 10:49

不知道你要干什么，用NETLINK不是要建SOCKET然后发包吗？

页: [1]

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netlink求救！