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25985edced
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
680 lines
16 KiB
C
680 lines
16 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 <linux/delay.h>
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#include <linux/slab.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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static DEFINE_SPINLOCK(scsi_nl_lock);
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static struct list_head scsi_nl_drivers;
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static u32 scsi_nl_state;
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#define STATE_EHANDLER_BSY 0x00000001
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struct scsi_nl_transport {
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int (*msg_handler)(struct sk_buff *);
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void (*event_handler)(struct notifier_block *, unsigned long, void *);
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unsigned int refcnt;
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int flags;
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};
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/* flags values (bit flags) */
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#define HANDLER_DELETING 0x1
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static struct scsi_nl_transport transports[SCSI_NL_MAX_TRANSPORTS] =
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{ {NULL, }, };
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struct scsi_nl_drvr {
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struct list_head next;
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int (*dmsg_handler)(struct Scsi_Host *shost, void *payload,
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u32 len, u32 pid);
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void (*devt_handler)(struct notifier_block *nb,
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unsigned long event, void *notify_ptr);
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struct scsi_host_template *hostt;
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u64 vendor_id;
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unsigned int refcnt;
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int flags;
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};
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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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unsigned long flags;
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u32 rlen;
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int err, tport;
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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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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 (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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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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spin_lock_irqsave(&scsi_nl_lock, flags);
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tport = hdr->transport;
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if ((tport < SCSI_NL_MAX_TRANSPORTS) &&
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!(transports[tport].flags & HANDLER_DELETING) &&
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(transports[tport].msg_handler)) {
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transports[tport].refcnt++;
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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err = transports[tport].msg_handler(skb);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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transports[tport].refcnt--;
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} else
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err = -ENOENT;
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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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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struct scsi_nl_drvr *driver;
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unsigned long flags;
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int tport;
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if (n->protocol != NETLINK_SCSITRANSPORT)
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return NOTIFY_DONE;
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spin_lock_irqsave(&scsi_nl_lock, flags);
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scsi_nl_state |= STATE_EHANDLER_BSY;
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/*
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* Pass event on to any transports that may be listening
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*/
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for (tport = 0; tport < SCSI_NL_MAX_TRANSPORTS; tport++) {
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if (!(transports[tport].flags & HANDLER_DELETING) &&
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(transports[tport].event_handler)) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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transports[tport].event_handler(this, event, ptr);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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}
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}
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/*
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* Pass event on to any drivers that may be listening
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*/
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list_for_each_entry(driver, &scsi_nl_drivers, next) {
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if (!(driver->flags & HANDLER_DELETING) &&
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(driver->devt_handler)) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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driver->devt_handler(this, event, ptr);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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}
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}
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scsi_nl_state &= ~STATE_EHANDLER_BSY;
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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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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* GENERIC SCSI transport receive and event handlers
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*/
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/**
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* scsi_generic_msg_handler - receive message handler for GENERIC transport messages
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* @skb: socket receive buffer
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**/
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static int
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scsi_generic_msg_handler(struct sk_buff *skb)
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{
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struct nlmsghdr *nlh = nlmsg_hdr(skb);
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struct scsi_nl_hdr *snlh = NLMSG_DATA(nlh);
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struct scsi_nl_drvr *driver;
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struct Scsi_Host *shost;
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unsigned long flags;
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int err = 0, match, pid;
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pid = NETLINK_CREDS(skb)->pid;
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switch (snlh->msgtype) {
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case SCSI_NL_SHOST_VENDOR:
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{
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struct scsi_nl_host_vendor_msg *msg = NLMSG_DATA(nlh);
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/* Locate the driver that corresponds to the message */
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spin_lock_irqsave(&scsi_nl_lock, flags);
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match = 0;
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list_for_each_entry(driver, &scsi_nl_drivers, next) {
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if (driver->vendor_id == msg->vendor_id) {
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match = 1;
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break;
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}
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}
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if ((!match) || (!driver->dmsg_handler)) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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err = -ESRCH;
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goto rcv_exit;
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}
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if (driver->flags & HANDLER_DELETING) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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err = -ESHUTDOWN;
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goto rcv_exit;
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}
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driver->refcnt++;
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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/* if successful, scsi_host_lookup takes a shost reference */
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shost = scsi_host_lookup(msg->host_no);
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if (!shost) {
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err = -ENODEV;
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goto driver_exit;
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}
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/* is this host owned by the vendor ? */
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if (shost->hostt != driver->hostt) {
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err = -EINVAL;
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goto vendormsg_put;
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}
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/* pass message on to the driver */
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err = driver->dmsg_handler(shost, (void *)&msg[1],
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msg->vmsg_datalen, pid);
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vendormsg_put:
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/* release reference by scsi_host_lookup */
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scsi_host_put(shost);
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driver_exit:
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/* release our own reference on the registration object */
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spin_lock_irqsave(&scsi_nl_lock, flags);
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driver->refcnt--;
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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break;
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}
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default:
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err = -EBADR;
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break;
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}
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rcv_exit:
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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__, snlh->msgtype, err);
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return err;
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}
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/**
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* scsi_nl_add_transport -
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* Registers message and event handlers for a transport. Enables
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* receipt of netlink messages and events to a transport.
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*
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* @tport: transport registering handlers
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* @msg_handler: receive message handler callback
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* @event_handler: receive event handler callback
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**/
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int
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scsi_nl_add_transport(u8 tport,
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int (*msg_handler)(struct sk_buff *),
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void (*event_handler)(struct notifier_block *, unsigned long, void *))
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{
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unsigned long flags;
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int err = 0;
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if (tport >= SCSI_NL_MAX_TRANSPORTS)
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return -EINVAL;
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spin_lock_irqsave(&scsi_nl_lock, flags);
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if (scsi_nl_state & STATE_EHANDLER_BSY) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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msleep(1);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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}
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if (transports[tport].msg_handler || transports[tport].event_handler) {
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err = -EALREADY;
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goto register_out;
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}
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transports[tport].msg_handler = msg_handler;
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transports[tport].event_handler = event_handler;
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transports[tport].flags = 0;
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transports[tport].refcnt = 0;
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register_out:
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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return err;
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}
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EXPORT_SYMBOL_GPL(scsi_nl_add_transport);
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/**
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* scsi_nl_remove_transport -
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* Disable transport receiption of messages and events
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*
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* @tport: transport deregistering handlers
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*
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**/
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void
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scsi_nl_remove_transport(u8 tport)
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{
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unsigned long flags;
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spin_lock_irqsave(&scsi_nl_lock, flags);
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if (scsi_nl_state & STATE_EHANDLER_BSY) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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msleep(1);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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}
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if (tport < SCSI_NL_MAX_TRANSPORTS) {
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transports[tport].flags |= HANDLER_DELETING;
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while (transports[tport].refcnt != 0) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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schedule_timeout_uninterruptible(HZ/4);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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}
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transports[tport].msg_handler = NULL;
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transports[tport].event_handler = NULL;
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transports[tport].flags = 0;
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}
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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return;
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}
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EXPORT_SYMBOL_GPL(scsi_nl_remove_transport);
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/**
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* scsi_nl_add_driver -
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* A driver is registering its interfaces for SCSI netlink messages
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*
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* @vendor_id: A unique identification value for the driver.
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* @hostt: address of the driver's host template. Used
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* to verify an shost is bound to the driver
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* @nlmsg_handler: receive message handler callback
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* @nlevt_handler: receive event handler callback
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*
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* Returns:
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* 0 on Success
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* error result otherwise
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**/
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int
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scsi_nl_add_driver(u64 vendor_id, struct scsi_host_template *hostt,
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int (*nlmsg_handler)(struct Scsi_Host *shost, void *payload,
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u32 len, u32 pid),
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void (*nlevt_handler)(struct notifier_block *nb,
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unsigned long event, void *notify_ptr))
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{
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struct scsi_nl_drvr *driver;
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unsigned long flags;
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driver = kzalloc(sizeof(*driver), GFP_KERNEL);
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if (unlikely(!driver)) {
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printk(KERN_ERR "%s: allocation failure\n", __func__);
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return -ENOMEM;
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}
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driver->dmsg_handler = nlmsg_handler;
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driver->devt_handler = nlevt_handler;
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driver->hostt = hostt;
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driver->vendor_id = vendor_id;
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spin_lock_irqsave(&scsi_nl_lock, flags);
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if (scsi_nl_state & STATE_EHANDLER_BSY) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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msleep(1);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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}
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list_add_tail(&driver->next, &scsi_nl_drivers);
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL_GPL(scsi_nl_add_driver);
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/**
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* scsi_nl_remove_driver -
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* An driver is unregistering with the SCSI netlink messages
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*
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* @vendor_id: The unique identification value for the driver.
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**/
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void
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scsi_nl_remove_driver(u64 vendor_id)
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{
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struct scsi_nl_drvr *driver;
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unsigned long flags;
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spin_lock_irqsave(&scsi_nl_lock, flags);
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if (scsi_nl_state & STATE_EHANDLER_BSY) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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msleep(1);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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}
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list_for_each_entry(driver, &scsi_nl_drivers, next) {
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if (driver->vendor_id == vendor_id) {
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driver->flags |= HANDLER_DELETING;
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while (driver->refcnt != 0) {
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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schedule_timeout_uninterruptible(HZ/4);
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spin_lock_irqsave(&scsi_nl_lock, flags);
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}
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list_del(&driver->next);
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kfree(driver);
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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return;
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}
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}
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spin_unlock_irqrestore(&scsi_nl_lock, flags);
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printk(KERN_ERR "%s: removal of driver failed - vendor_id 0x%llx\n",
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__func__, (unsigned long long)vendor_id);
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return;
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}
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EXPORT_SYMBOL_GPL(scsi_nl_remove_driver);
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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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int error;
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INIT_LIST_HEAD(&scsi_nl_drivers);
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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 receive handler failed\n",
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__func__);
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netlink_unregister_notifier(&scsi_netlink_notifier);
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return;
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}
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/* Register the entry points for the generic SCSI transport */
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error = scsi_nl_add_transport(SCSI_NL_TRANSPORT,
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scsi_generic_msg_handler, NULL);
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if (error)
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printk(KERN_ERR "%s: register of GENERIC transport handler"
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" failed - %d\n", __func__, error);
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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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scsi_nl_remove_transport(SCSI_NL_TRANSPORT);
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if (scsi_nl_sock) {
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netlink_kernel_release(scsi_nl_sock);
|
|
netlink_unregister_notifier(&scsi_netlink_notifier);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Exported Interfaces
|
|
*/
|
|
|
|
/**
|
|
* scsi_nl_send_transport_msg -
|
|
* Generic function to send a single message from a SCSI transport to
|
|
* a single process
|
|
*
|
|
* @pid: receiving pid
|
|
* @hdr: message payload
|
|
*
|
|
**/
|
|
void
|
|
scsi_nl_send_transport_msg(u32 pid, struct scsi_nl_hdr *hdr)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct nlmsghdr *nlh;
|
|
const char *fn;
|
|
char *datab;
|
|
u32 len, skblen;
|
|
int err;
|
|
|
|
if (!scsi_nl_sock) {
|
|
err = -ENOENT;
|
|
fn = "netlink socket";
|
|
goto msg_fail;
|
|
}
|
|
|
|
len = NLMSG_SPACE(hdr->msglen);
|
|
skblen = NLMSG_SPACE(len);
|
|
|
|
skb = alloc_skb(skblen, GFP_KERNEL);
|
|
if (!skb) {
|
|
err = -ENOBUFS;
|
|
fn = "alloc_skb";
|
|
goto msg_fail;
|
|
}
|
|
|
|
nlh = nlmsg_put(skb, pid, 0, SCSI_TRANSPORT_MSG, len - sizeof(*nlh), 0);
|
|
if (!nlh) {
|
|
err = -ENOBUFS;
|
|
fn = "nlmsg_put";
|
|
goto msg_fail_skb;
|
|
}
|
|
datab = NLMSG_DATA(nlh);
|
|
memcpy(datab, hdr, hdr->msglen);
|
|
|
|
err = nlmsg_unicast(scsi_nl_sock, skb, pid);
|
|
if (err < 0) {
|
|
fn = "nlmsg_unicast";
|
|
/* nlmsg_unicast already kfree_skb'd */
|
|
goto msg_fail;
|
|
}
|
|
|
|
return;
|
|
|
|
msg_fail_skb:
|
|
kfree_skb(skb);
|
|
msg_fail:
|
|
printk(KERN_WARNING
|
|
"%s: Dropped Message : pid %d Transport %d, msgtype x%x, "
|
|
"msglen %d: %s : err %d\n",
|
|
__func__, pid, hdr->transport, hdr->msgtype, hdr->msglen,
|
|
fn, err);
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL_GPL(scsi_nl_send_transport_msg);
|
|
|
|
|
|
/**
|
|
* scsi_nl_send_vendor_msg - called to send a shost vendor unique message
|
|
* to a specific process id.
|
|
*
|
|
* @pid: process id of the receiver
|
|
* @host_no: host # sending the message
|
|
* @vendor_id: unique identifier for the driver's vendor
|
|
* @data_len: amount, in bytes, of vendor unique payload data
|
|
* @data_buf: pointer to vendor unique data buffer
|
|
*
|
|
* Returns:
|
|
* 0 on successful return
|
|
* otherwise, failing error code
|
|
*
|
|
* Notes:
|
|
* This routine assumes no locks are held on entry.
|
|
*/
|
|
int
|
|
scsi_nl_send_vendor_msg(u32 pid, unsigned short host_no, u64 vendor_id,
|
|
char *data_buf, u32 data_len)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct nlmsghdr *nlh;
|
|
struct scsi_nl_host_vendor_msg *msg;
|
|
u32 len, skblen;
|
|
int err;
|
|
|
|
if (!scsi_nl_sock) {
|
|
err = -ENOENT;
|
|
goto send_vendor_fail;
|
|
}
|
|
|
|
len = SCSI_NL_MSGALIGN(sizeof(*msg) + data_len);
|
|
skblen = NLMSG_SPACE(len);
|
|
|
|
skb = alloc_skb(skblen, GFP_KERNEL);
|
|
if (!skb) {
|
|
err = -ENOBUFS;
|
|
goto send_vendor_fail;
|
|
}
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
|
|
skblen - sizeof(*nlh), 0);
|
|
if (!nlh) {
|
|
err = -ENOBUFS;
|
|
goto send_vendor_fail_skb;
|
|
}
|
|
msg = NLMSG_DATA(nlh);
|
|
|
|
INIT_SCSI_NL_HDR(&msg->snlh, SCSI_NL_TRANSPORT,
|
|
SCSI_NL_SHOST_VENDOR, len);
|
|
msg->vendor_id = vendor_id;
|
|
msg->host_no = host_no;
|
|
msg->vmsg_datalen = data_len; /* bytes */
|
|
memcpy(&msg[1], data_buf, data_len);
|
|
|
|
err = nlmsg_unicast(scsi_nl_sock, skb, pid);
|
|
if (err)
|
|
/* nlmsg_multicast already kfree_skb'd */
|
|
goto send_vendor_fail;
|
|
|
|
return 0;
|
|
|
|
send_vendor_fail_skb:
|
|
kfree_skb(skb);
|
|
send_vendor_fail:
|
|
printk(KERN_WARNING
|
|
"%s: Dropped SCSI Msg : host %d vendor_unique - err %d\n",
|
|
__func__, host_no, err);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(scsi_nl_send_vendor_msg);
|
|
|
|
|