/* * 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 (!netlink_capable(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", __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; }