Question

我正在尝试使用libnl-3-routing添加路由（内核2.6.32-57）。我使用文档：

Netlink library
Netlink routing

但是路由章节是空的......;）

问题是“无效输入数据或参数”的内核响应。我已经使用netlink做了一些测试，如果我设置了以下属性，我可以添加一个路由：

接口索引
目的地地址
网关地址

面具

    int ret = 0;
    // Create the route.
    struct rtnl_route* rulesRoute = rtnl_route_alloc();
    rtnl_route_set_iif(rulesRoute, AF_INET); // IPV4

    // Set parameters.
    rtnl_route_set_scope(rulesRoute, RT_SCOPE_UNIVERSE);
    rtnl_route_set_table(rulesRoute, RT_TABLE_MAIN);
    rtnl_route_set_protocol(rulesRoute, RTPROT_STATIC);
    uint8_t maskTest = 16;
    rtnl_route_set_scope(rulesRoute, maskTest);

    // Set the destination.
    char destinationAddr[] = "0.0.0.0";
    nl_addr* dstAddr = nl_addr_build(AF_INET, destinationAddr, 8);
    ret = rtnl_route_set_dst(rulesRoute, dstAddr);
    if (ret != 0)
        std::cout << "Error in setting destination route: " << nl_geterror(ret) << std::endl;

    // Set the next hop.
    struct rtnl_nexthop* route_nexthop = rtnl_route_nh_alloc();
    char gatewayAddr[] = "10.110.0.240";
    nl_addr* gatewAddr = nl_addr_build(AF_INET, gatewayAddr, 12);
    rtnl_route_nh_set_gateway(route_nexthop, gatewAddr);
    rtnl_route_nh_set_ifindex(route_nexthop, 2);
    rtnl_route_add_nexthop(rulesRoute, route_nexthop);
    ret = rtnl_route_add(m_nlSocket, rulesRoute, 0);
    if (ret != 0)
        std::cout << "Kernel response:" << nl_geterror(ret) << std::endl;

我在路由表中添加了信息：

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.110.0.0      0.0.0.0         255.255.255.0   U     1      0        0 eth3
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth3
0.0.0.0         10.110.0.1      0.0.0.0         UG    0      0        0 eth3

感谢您帮助解决此问题

Answer 1

问题来自于功能nl_addr_build的错误使用。

替换为nl_addr_parse（）并且正在运行。

nl_addr_build：解析二进制地址

nl_addr_parse：解析像“10.10.1.10”这样的char * addr

使用libnl-3-route添加路由“无效的输入数据或参数”

1 个答案: