static void netlink_data_ready(struct sock *sk, int len)
{
struct netlink_opt *nlk = nlk_sk(sk);
if (nlk->data_ready)
nlk->data_ready(sk, len);
netlink_rcv_wake(sk);
}
static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
struct msghdr *msg, size_t len,
int flags)
{
struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
struct scm_cookie scm;
struct sock *sk = sock->sk;
struct netlink_opt *nlk = nlk_sk(sk);
int noblock = flags&MSG_DONTWAIT;
size_t copied;
struct sk_buff *skb;
int err;
if (flags&MSG_OOB)
return -EOPNOTSUPP;
copied = 0;
skb = skb_recv_datagram(sk,flags,noblock,&err);
if (skb==NULL)
goto out;
msg->msg_namelen = 0;
copied = skb->len;
if (len < copied) {
msg->msg_flags |= MSG_TRUNC;
copied = len;
}
skb->h.raw = skb->data;
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
if (msg->msg_name) {
struct sockaddr_nl *addr = (struct sockaddr_nl*)msg->msg_name;
addr->nl_family = AF_NETLINK;
addr->nl_pad = 0;
addr->nl_pid = NETLINK_CB(skb).pid;
addr->nl_groups = NETLINK_CB(skb).dst_groups;
msg->msg_namelen = sizeof(*addr);
}
if (NULL == siocb->scm) {
memset(&scm, 0, sizeof(scm));
siocb->scm = &scm;
}
siocb->scm->creds = *NETLINK_CREDS(skb);
skb_free_datagram(sk, skb);
if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2)
netlink_dump(sk);
scm_recv(sock, msg, siocb->scm, flags);
out:
netlink_rcv_wake(sk);
return err ? : copied;
}
static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, int len,
int flags, struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
int noblock = flags&MSG_DONTWAIT;
int copied;
struct sk_buff *skb;
int err;
if (flags&MSG_OOB)
return -EOPNOTSUPP;
copied = 0;
skb = skb_recv_datagram(sk,flags,noblock,&err);
if (skb==NULL)
goto out;
msg->msg_namelen = 0;
copied = skb->len;
if (len < copied) {
msg->msg_flags |= MSG_TRUNC;
copied = len;
}
skb->h.raw = skb->data;
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
if (msg->msg_name) {
struct sockaddr_nl *addr = (struct sockaddr_nl*)msg->msg_name;
addr->nl_family = AF_NETLINK;
addr->nl_pid = NETLINK_CB(skb).pid;
addr->nl_groups = NETLINK_CB(skb).dst_groups;
msg->msg_namelen = sizeof(*addr);
}
scm->creds = *NETLINK_CREDS(skb);
skb_free_datagram(sk, skb);
if (sk->protinfo.af_netlink->cb
&& atomic_read(&sk->rmem_alloc) <= sk->rcvbuf/2)
netlink_dump(sk);
out:
netlink_rcv_wake(sk);
return err ? : copied;
}
void netlink_data_ready(struct sock *sk, int len)
{
if (sk->protinfo.af_netlink->data_ready)
sk->protinfo.af_netlink->data_ready(sk, len);
netlink_rcv_wake(sk);
}