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我试图编写一个程序,在linux路由表中添加/更新路由。 为此,我使用struct rtmsg来更新数据&将它发送到以NETLINK_ROUTE打开的fd。使用netlink添加/更新iptables?
179 struct {
180 struct nlmsghdr n;
181 struct rtmsg r;
182 char buf[RTA_BUF_SIZE];
183 } req;
184 int v4_addr;
185 int if_idx;
186
187 memset(&req, 0, sizeof(req));
188
189 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
190 req.n.nlmsg_flags = NLM_F_REQUEST | flags;
191 req.n.nlmsg_type = cmd;
192 req.r.rtm_family = AF_INET;
193 req.r.rtm_table = RT_TABLE_MAIN;
194 req.r.rtm_protocol = RTPROT_BOOT;
195 req.r.rtm_scope = RT_SCOPE_LINK;
196 req.r.rtm_type = RTN_UNICAST;
...
fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
除此之外,我还希望扩展程序来操纵iptables。 似乎与协议NETLINK_NFLOG套接字应该解决我的问题,但我怎么发送数据?
fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_NFLOG);
e.x.我需要在nat表中添加一个SNAT规则,我该如何使用netlink来做到这一点?如何在NF情况下传递数据?