[SCSI] SCSI and FC Transport: add netlink support for posting of transport events (84314fd4) · Commits · 戴 / test

drivers/scsi/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,11 @@ config SCSI
		However, do not compile this as a module if your root file system
		(the one containing the directory /) is located on a SCSI device.

		config SCSI_NETLINK
		tristate
		default n
		select NET

		config SCSI_PROC_FS
		bool "legacy /proc/scsi/ support"
		depends on SCSI && PROC_FS
		@@ -222,6 +227,7 @@ config SCSI_SPI_ATTRS
		config SCSI_FC_ATTRS
		tristate "FiberChannel Transport Attributes"
		depends on SCSI
		select SCSI_NETLINK
		help
		If you wish to export transport-specific information about
		each attached FiberChannel device to sysfs, say Y.

drivers/scsi/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -159,6 +159,7 @@ scsi_mod-y += scsi.o hosts.o scsi_ioctl.o constants.o \
		scsicam.o scsi_error.o scsi_lib.o \
		scsi_scan.o scsi_sysfs.o \
		scsi_devinfo.o
		scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o
		scsi_mod-$(CONFIG_SYSCTL) += scsi_sysctl.o
		scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o

drivers/scsi/scsi.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1118,6 +1118,8 @@ static int __init init_scsi(void)
		for_each_possible_cpu(i)
		INIT_LIST_HEAD(&per_cpu(scsi_done_q, i));

		scsi_netlink_init();

		printk(KERN_NOTICE "SCSI subsystem initialized\n");
		return 0;

		@@ -1138,6 +1140,7 @@ cleanup_queue:

		static void __exit exit_scsi(void)
		{
		scsi_netlink_exit();
		scsi_sysfs_unregister();
		scsi_exit_sysctl();
		scsi_exit_hosts();

drivers/scsi/scsi_netlink.c

0 → 100644

+199 −0

Original line number	Diff line number	Diff line
		/*
		* 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 <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. Extracts message from a receive buffer.
		* Validates message header and calls appropriate transport message handler
		*
		* @skb: socket receive buffer
		*
		**/
		static void
		scsi_nl_rcv_msg(struct sk_buff *skb)
		{
		struct nlmsghdr *nlh;
		struct scsi_nl_hdr *hdr;
		uint32_t rlen;
		int err;

		while (skb->len >= NLMSG_SPACE(0)) {
		err = 0;

		nlh = (struct nlmsghdr *) skb->data;
		if ((nlh->nlmsg_len < (sizeof(nlh) + sizeof(hdr))) \|\|
		(skb->len < nlh->nlmsg_len)) {
		printk(KERN_WARNING "%s: discarding partial skb\n",
		__FUNCTION__);
		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 (security_netlink_recv(skb, CAP_SYS_ADMIN)) {
		err = -EPERM;
		goto next_msg;
		}

		if (nlh->nlmsg_len < (sizeof(*nlh) + hdr->msglen)) {
		printk(KERN_WARNING "%s: discarding partial message\n",
		__FUNCTION__);
		return;
		}

		/*
		* We currently don't support anyone sending us a message
		*/

		next_msg:
		if ((err) \|\| (nlh->nlmsg_flags & NLM_F_ACK))
		netlink_ack(skb, nlh, err);

		skb_pull(skb, rlen);
		}
		}


		/**
		* scsi_nl_rcv_msg -
		* Receive handler for a socket. Extracts a received message buffer from
		* the socket, and starts message processing.
		*
		* @sk: socket
		* @len: unused
		*
		**/
		static void
		scsi_nl_rcv(struct sock *sk, int len)
		{
		struct sk_buff *skb;

		while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
		scsi_nl_rcv_msg(skb);
		kfree_skb(skb);
		}
		}


		/**
		* scsi_nl_rcv_event -
		* Event handler for a netlink socket.
		*
		* @this: event notifier block
		* @event: event type
		* @ptr: event payload
		*
		**/
		static int
		scsi_nl_rcv_event(struct notifier_block this, unsigned long event, void ptr)
		{
		struct netlink_notify *n = ptr;

		if (n->protocol != NETLINK_SCSITRANSPORT)
		return NOTIFY_DONE;

		/*
		* Currently, we are not tracking PID's, etc. There is nothing
		* to handle.
		*/

		return NOTIFY_DONE;
		}

		static struct notifier_block scsi_netlink_notifier = {
		.notifier_call = scsi_nl_rcv_event,
		};


		/**
		* scsi_netlink_init -
		* Called by SCSI subsystem to intialize the SCSI transport netlink
		* interface
		*
		**/
		void
		scsi_netlink_init(void)
		{
		int error;

		error = netlink_register_notifier(&scsi_netlink_notifier);
		if (error) {
		printk(KERN_ERR "%s: register of event handler failed - %d\n",
		__FUNCTION__, error);
		return;
		}

		scsi_nl_sock = netlink_kernel_create(NETLINK_SCSITRANSPORT,
		SCSI_NL_GRP_CNT, scsi_nl_rcv, THIS_MODULE);
		if (!scsi_nl_sock) {
		printk(KERN_ERR "%s: register of recieve handler failed\n",
		__FUNCTION__);
		netlink_unregister_notifier(&scsi_netlink_notifier);
		}

		return;
		}


		/**
		* scsi_netlink_exit -
		* Called by SCSI subsystem to disable the SCSI transport netlink
		* interface
		*
		**/
		void
		scsi_netlink_exit(void)
		{
		if (scsi_nl_sock) {
		sock_release(scsi_nl_sock->sk_socket);
		netlink_unregister_notifier(&scsi_netlink_notifier);
		}

		return;
		}

drivers/scsi/scsi_priv.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,7 @@ struct scsi_cmnd;
		struct scsi_device;
		struct scsi_host_template;
		struct Scsi_Host;
		struct scsi_nl_hdr;


		/*
		@@ -110,6 +111,16 @@ extern void __scsi_remove_device(struct scsi_device *);

		extern struct bus_type scsi_bus_type;

		/* scsi_netlink.c */
		#ifdef CONFIG_SCSI_NETLINK
		extern void scsi_netlink_init(void);
		extern void scsi_netlink_exit(void);
		extern struct sock *scsi_nl_sock;
		#else
		static inline void scsi_netlink_init(void) {}
		static inline void scsi_netlink_exit(void) {}
		#endif

		/*
		* internal scsi timeout functions: for use by mid-layer and transport
		* classes.

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