分类: C/C++
2016-09-08 21:19:47
The following example creates a NETLINK_ROUTE netlink socket which will listen to the RTMGRP_LINK (network interface create/delete/up/down events) and RTMGRP_IPV4_IFADDR (IPv4 addresses add/delete events) multicast groups. struct sockaddr_nl sa; memset(&sa, 0, sizeof(sa)); sa.nl_family = AF_NETLINK; sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR; fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); bind(fd, (struct sockaddr *) &sa, sizeof(sa)); The next example demonstrates how to send a netlink message to the kernel (pid 0). Note that the application must take care of message sequence numbers in order to reliably track acknowledgements. struct nlmsghdr *nh; /* The nlmsghdr with payload to send */ struct sockaddr_nl sa; struct iovec iov = { nh, nh->nlmsg_len }; struct msghdr msg; msg = { &sa, sizeof(sa), &iov, 1, NULL, 0, 0 }; memset(&sa, 0, sizeof(sa)); sa.nl_family = AF_NETLINK; nh->nlmsg_pid = 0; nh->nlmsg_seq = ++sequence_number; /* Request an ack from kernel by setting NLM_F_ACK */ nh->nlmsg_flags |= NLM_F_ACK; sendmsg(fd, &msg, 0); And the last example is about reading netlink message. int len; char buf[4096]; struct iovec iov = { buf, sizeof(buf) }; struct sockaddr_nl sa; struct msghdr msg; struct nlmsghdr *nh; msg = { &sa, sizeof(sa), &iov, 1, NULL, 0, 0 }; len = recvmsg(fd, &msg, 0); for (nh = (struct nlmsghdr *) buf; NLMSG_OK (nh, len); nh = NLMSG_NEXT (nh, len)) { /* The end of multipart message */ if (nh->nlmsg_type == NLMSG_DONE) return; if (nh->nlmsg_type == NLMSG_ERROR) /* Do some error handling */ ... /* Continue with parsing payload */ ... }