1a59d1b8e0
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
145 lines
2.9 KiB
C
145 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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 <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/export.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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u32 rlen;
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int err, tport;
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while (skb->len >= NLMSG_HDRLEN) {
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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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goto next_msg;
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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 (!netlink_capable(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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goto next_msg;
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}
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/*
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* Deliver message to the appropriate transport
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*/
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tport = hdr->transport;
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if (tport == SCSI_NL_TRANSPORT) {
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switch (hdr->msgtype) {
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case SCSI_NL_SHOST_VENDOR:
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/* Locate the driver that corresponds to the message */
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err = -ESRCH;
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break;
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default:
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err = -EBADR;
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break;
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}
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if (err)
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printk(KERN_WARNING "%s: Msgtype %d failed - err %d\n",
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__func__, hdr->msgtype, err);
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}
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else
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err = -ENOENT;
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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, NULL);
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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_netlink_init - Called by SCSI subsystem to initialize
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* 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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struct netlink_kernel_cfg cfg = {
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.input = scsi_nl_rcv_msg,
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.groups = SCSI_NL_GRP_CNT,
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};
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scsi_nl_sock = netlink_kernel_create(&init_net, NETLINK_SCSITRANSPORT,
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&cfg);
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if (!scsi_nl_sock) {
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printk(KERN_ERR "%s: register of receive handler failed\n",
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__func__);
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return;
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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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}
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return;
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}
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