175 строки
3.8 KiB
C
175 строки
3.8 KiB
C
/*
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* scsi_netlink.c - SCSI Transport Netlink Interface
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*
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* Copyright (C) 2006 James Smart, Emulex Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/time.h>
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#include <linux/jiffies.h>
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#include <linux/security.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <scsi/scsi_netlink.h>
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#include "scsi_priv.h"
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struct sock *scsi_nl_sock = NULL;
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EXPORT_SYMBOL_GPL(scsi_nl_sock);
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/**
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* scsi_nl_rcv_msg - Receive message handler.
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* @skb: socket receive buffer
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*
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* Description: Extracts message from a receive buffer.
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* Validates message header and calls appropriate transport message handler
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*
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*
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**/
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static void
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scsi_nl_rcv_msg(struct sk_buff *skb)
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{
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struct nlmsghdr *nlh;
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struct scsi_nl_hdr *hdr;
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uint32_t rlen;
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int err;
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while (skb->len >= NLMSG_SPACE(0)) {
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err = 0;
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nlh = nlmsg_hdr(skb);
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if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) ||
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(skb->len < nlh->nlmsg_len)) {
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printk(KERN_WARNING "%s: discarding partial skb\n",
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__func__);
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return;
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}
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rlen = NLMSG_ALIGN(nlh->nlmsg_len);
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if (rlen > skb->len)
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rlen = skb->len;
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if (nlh->nlmsg_type != SCSI_TRANSPORT_MSG) {
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err = -EBADMSG;
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return;
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}
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hdr = NLMSG_DATA(nlh);
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if ((hdr->version != SCSI_NL_VERSION) ||
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(hdr->magic != SCSI_NL_MAGIC)) {
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err = -EPROTOTYPE;
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goto next_msg;
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}
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if (security_netlink_recv(skb, CAP_SYS_ADMIN)) {
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err = -EPERM;
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goto next_msg;
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}
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if (nlh->nlmsg_len < (sizeof(*nlh) + hdr->msglen)) {
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printk(KERN_WARNING "%s: discarding partial message\n",
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__func__);
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return;
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}
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/*
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* We currently don't support anyone sending us a message
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*/
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next_msg:
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if ((err) || (nlh->nlmsg_flags & NLM_F_ACK))
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netlink_ack(skb, nlh, err);
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skb_pull(skb, rlen);
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}
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}
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/**
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* scsi_nl_rcv_event - Event handler for a netlink socket.
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* @this: event notifier block
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* @event: event type
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* @ptr: event payload
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*
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**/
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static int
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scsi_nl_rcv_event(struct notifier_block *this, unsigned long event, void *ptr)
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{
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struct netlink_notify *n = ptr;
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if (n->protocol != NETLINK_SCSITRANSPORT)
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return NOTIFY_DONE;
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/*
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* Currently, we are not tracking PID's, etc. There is nothing
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* to handle.
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*/
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return NOTIFY_DONE;
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}
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static struct notifier_block scsi_netlink_notifier = {
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.notifier_call = scsi_nl_rcv_event,
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};
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/**
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* scsi_netlink_init - Called by SCSI subsystem to intialize the SCSI transport netlink interface
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*
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**/
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void
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scsi_netlink_init(void)
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{
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int error;
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error = netlink_register_notifier(&scsi_netlink_notifier);
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if (error) {
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printk(KERN_ERR "%s: register of event handler failed - %d\n",
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__func__, error);
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return;
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}
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scsi_nl_sock = netlink_kernel_create(&init_net, NETLINK_SCSITRANSPORT,
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SCSI_NL_GRP_CNT, scsi_nl_rcv_msg, NULL,
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THIS_MODULE);
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if (!scsi_nl_sock) {
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printk(KERN_ERR "%s: register of recieve handler failed\n",
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__func__);
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netlink_unregister_notifier(&scsi_netlink_notifier);
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}
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return;
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}
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/**
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* scsi_netlink_exit - Called by SCSI subsystem to disable the SCSI transport netlink interface
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*
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**/
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void
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scsi_netlink_exit(void)
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{
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if (scsi_nl_sock) {
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netlink_kernel_release(scsi_nl_sock);
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netlink_unregister_notifier(&scsi_netlink_notifier);
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}
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return;
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}
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