Listening for netlink broadcasts in a kernel module -

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the selinux module sends out netlink broadcast listening sockets. i'm wondering if it's possible listen netlink broadcast within kernel module?

from selinux netlink code:

netlink_broadcast(selnl, skb, 0, selnlgrp_avc, gfp_user);

i found can listen netlink data through use of regular sockets. and, yes, it's possible in kernel-space.

you need create , bind socket:

struct sock *sock = null; struct sockaddr_nl addr = { 0 };  /* create netlink socket selinux traffic */ int rc = sock_create_kern(af_netlink, sock_raw, netlink_selinux,               &ctx.sock);  if (rc)     return rc;  addr.nl_family  = af_netlink; addr.nl_pid     = 0; addr.nl_groups  = selnlgrp_avc;  rc = kernel_bind(ctx.sock, (struct sockaddr *) &addr, sizeof(addr)); if (rc)     return rc;  /* setup socket callback */ sock = ctx.sock->sk; sock->sk_data_ready = netlink_data_ready; sock->sk_allocation = gfp_kernel;

to receive data:

static void netlink_data_ready(struct sock *sk, int bytes) {     struct sk_buff *skb = null;     struct nlmsghdr *nlh = null;     int rc = 0;      /* receive data packet (blocking) */     skb = skb_recv_datagram(sk, 0, 0, &rc);     if (rc) {         printk(kern_error "failed on skb_recv_datagram(). rc=%d.", -rc);         return;     }      nlh = (struct nlmsghdr *) skb->data;     if (!nlh || !nlmsg_ok(nlh, bytes)) {         printk(kern_error "invalid netlink header data.");         return;     }      if (nlh->nlmsg_type == selnl_msg_policyload ||         nlh->nlmsg_type == selnl_msg_setenforce) {          /* insert code here */     } }

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