在Linux上接收所有组播ICMPv6数据包(Receive all multicast ICMPv6 packets on Linux)

 我希望接收到达某个接口的所有多播IPv6数据包，如果可能的话，不需要在第2层上操作。 
 
 我为原始ICMPv6数据包打开一个套接字，并且接收专用于我的机器的单播数据包工作正常。 然而，许多ICMPv6分组是链路本地多播（例如，邻居请求）。 侦听所有多播流量的正确方法是什么，包括请求节点多播？ 目前我尝试使用IPV6_ADD_MEMBERSHIP添加多播组，但这似乎不起作用。 这是我的代码： 
 
/* open RAW socket to receive on */
if ((sockfd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
    perror("socket");
}

/* get device index */
memset(&if_idx, 0, sizeof(struct ifreq));
strncpy(if_idx.ifr_name, DEVNAME, IFNAMSIZ-1);
if (ioctl(sockfd, SIOCGIFINDEX, &if_idx) < 0) {
    perror("SIOCGIFINDEX");
}

/* configure to receive all multicast packets on this interface */
memset(&mreq, 0, sizeof(struct ipv6_mreq));
inet_pton(AF_INET6, "ff02::", &mreq.ipv6mr_multiaddr);
mreq.ipv6mr_interface = if_idx.ifr_ifindex;
if (setsockopt(sockfd, SOL_SOCKET, IPV6_ADD_MEMBERSHIP, &mreq,
            sizeof(struct ipv6_mreq)) < 0) {
    perror("setsockopt");
}
 
 我究竟做错了什么？ 我想要的东西必须以某种方式。 我尝试将ff02 ::和ff02 :: 1：ff00：0作为组，后者甚至使setsockopt失败。 这是怎么回事？ 遗憾的是，关于IPv6多播编程的文档很少。 

I would like to receive all multicast IPv6 packets arriving on a certain interface, without resorting to operate on layer 2, if that is possible.
 
I open a socket for raw ICMPv6 packets, and receiving unicast packets dedicated for my machine works just fine. However many ICMPv6 packets are link-local multicast (e.g. neighbor solicitations). What's the right way to listen for all multicast traffic, including solicited-node multicast? Currently I try to add a multicast group with IPV6_ADD_MEMBERSHIP, but this does not seem to work. Here's my code:
 
/* open RAW socket to receive on */
if ((sockfd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
    perror("socket");
}

/* get device index */
memset(&if_idx, 0, sizeof(struct ifreq));
strncpy(if_idx.ifr_name, DEVNAME, IFNAMSIZ-1);
if (ioctl(sockfd, SIOCGIFINDEX, &if_idx) < 0) {
    perror("SIOCGIFINDEX");
}

/* configure to receive all multicast packets on this interface */
memset(&mreq, 0, sizeof(struct ipv6_mreq));
inet_pton(AF_INET6, "ff02::", &mreq.ipv6mr_multiaddr);
mreq.ipv6mr_interface = if_idx.ifr_ifindex;
if (setsockopt(sockfd, SOL_SOCKET, IPV6_ADD_MEMBERSHIP, &mreq,
            sizeof(struct ipv6_mreq)) < 0) {
    perror("setsockopt");
}
 
What am I doing wrong? What I want must be possible somehow. I tried ff02:: and ff02::1:ff00:0 as groups, and the latter even made setsockopt fail. What's going on? Unfortunately there's very little documentation on IPv6 multicast programming.

原文：https://stackoverflow.com/questions/12628953