mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 08:46:43 +07:00
e07ebea0cc
Signed-off-by: Hong Zhiguo <honkiko@gmail.com> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
159 lines
3.5 KiB
C
159 lines
3.5 KiB
C
/*
|
|
* scsi_netlink.c - SCSI Transport Netlink Interface
|
|
*
|
|
* Copyright (C) 2006 James Smart, Emulex Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
#include <linux/time.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/security.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/export.h>
|
|
#include <net/sock.h>
|
|
#include <net/netlink.h>
|
|
|
|
#include <scsi/scsi_netlink.h>
|
|
#include "scsi_priv.h"
|
|
|
|
struct sock *scsi_nl_sock = NULL;
|
|
EXPORT_SYMBOL_GPL(scsi_nl_sock);
|
|
|
|
/**
|
|
* scsi_nl_rcv_msg - Receive message handler.
|
|
* @skb: socket receive buffer
|
|
*
|
|
* Description: Extracts message from a receive buffer.
|
|
* Validates message header and calls appropriate transport message handler
|
|
*
|
|
*
|
|
**/
|
|
static void
|
|
scsi_nl_rcv_msg(struct sk_buff *skb)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct scsi_nl_hdr *hdr;
|
|
u32 rlen;
|
|
int err, tport;
|
|
|
|
while (skb->len >= NLMSG_HDRLEN) {
|
|
err = 0;
|
|
|
|
nlh = nlmsg_hdr(skb);
|
|
if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) ||
|
|
(skb->len < nlh->nlmsg_len)) {
|
|
printk(KERN_WARNING "%s: discarding partial skb\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
|
|
if (rlen > skb->len)
|
|
rlen = skb->len;
|
|
|
|
if (nlh->nlmsg_type != SCSI_TRANSPORT_MSG) {
|
|
err = -EBADMSG;
|
|
goto next_msg;
|
|
}
|
|
|
|
hdr = nlmsg_data(nlh);
|
|
if ((hdr->version != SCSI_NL_VERSION) ||
|
|
(hdr->magic != SCSI_NL_MAGIC)) {
|
|
err = -EPROTOTYPE;
|
|
goto next_msg;
|
|
}
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
err = -EPERM;
|
|
goto next_msg;
|
|
}
|
|
|
|
if (nlh->nlmsg_len < (sizeof(*nlh) + hdr->msglen)) {
|
|
printk(KERN_WARNING "%s: discarding partial message\n",
|
|
__func__);
|
|
goto next_msg;
|
|
}
|
|
|
|
/*
|
|
* Deliver message to the appropriate transport
|
|
*/
|
|
tport = hdr->transport;
|
|
if (tport == SCSI_NL_TRANSPORT) {
|
|
switch (hdr->msgtype) {
|
|
case SCSI_NL_SHOST_VENDOR:
|
|
/* Locate the driver that corresponds to the message */
|
|
err = -ESRCH;
|
|
break;
|
|
default:
|
|
err = -EBADR;
|
|
break;
|
|
}
|
|
if (err)
|
|
printk(KERN_WARNING "%s: Msgtype %d failed - err %d\n",
|
|
__func__, hdr->msgtype, err);
|
|
}
|
|
else
|
|
err = -ENOENT;
|
|
|
|
next_msg:
|
|
if ((err) || (nlh->nlmsg_flags & NLM_F_ACK))
|
|
netlink_ack(skb, nlh, err);
|
|
|
|
skb_pull(skb, rlen);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* scsi_netlink_init - Called by SCSI subsystem to initialize
|
|
* the SCSI transport netlink interface
|
|
*
|
|
**/
|
|
void
|
|
scsi_netlink_init(void)
|
|
{
|
|
struct netlink_kernel_cfg cfg = {
|
|
.input = scsi_nl_rcv_msg,
|
|
.groups = SCSI_NL_GRP_CNT,
|
|
};
|
|
|
|
scsi_nl_sock = netlink_kernel_create(&init_net, NETLINK_SCSITRANSPORT,
|
|
&cfg);
|
|
if (!scsi_nl_sock) {
|
|
printk(KERN_ERR "%s: register of receive handler failed\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/**
|
|
* scsi_netlink_exit - Called by SCSI subsystem to disable the SCSI transport netlink interface
|
|
*
|
|
**/
|
|
void
|
|
scsi_netlink_exit(void)
|
|
{
|
|
if (scsi_nl_sock) {
|
|
netlink_kernel_release(scsi_nl_sock);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|