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144 lines
2.9 KiB
144 lines
2.9 KiB
// 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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