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1 | /* |
2 | * scsi_netlink.c - SCSI Transport Netlink Interface |
3 | * |
4 | * Copyright (C) 2006 James Smart, Emulex Corporation |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | * |
20 | */ |
21 | #include <linux/time.h> |
22 | #include <linux/jiffies.h> |
23 | #include <linux/security.h> |
24 | #include <linux/delay.h> |
25 | #include <linux/slab.h> |
26 | #include <linux/export.h> |
27 | #include <net/sock.h> |
28 | #include <net/netlink.h> |
29 | |
30 | #include <scsi/scsi_netlink.h> |
31 | #include "scsi_priv.h" |
32 | |
33 | struct sock *scsi_nl_sock = NULL; |
34 | EXPORT_SYMBOL_GPL(scsi_nl_sock); |
35 | |
36 | /** |
37 | * scsi_nl_rcv_msg - Receive message handler. |
38 | * @skb: socket receive buffer |
39 | * |
40 | * Description: Extracts message from a receive buffer. |
41 | * Validates message header and calls appropriate transport message handler |
42 | * |
43 | * |
44 | **/ |
45 | static void |
46 | scsi_nl_rcv_msg(struct sk_buff *skb) |
47 | { |
48 | struct nlmsghdr *nlh; |
49 | struct scsi_nl_hdr *hdr; |
50 | u32 rlen; |
51 | int err, tport; |
52 | |
53 | while (skb->len >= NLMSG_SPACE(0)) { |
54 | err = 0; |
55 | |
56 | nlh = nlmsg_hdr(skb); |
57 | if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) || |
58 | (skb->len < nlh->nlmsg_len)) { |
59 | printk(KERN_WARNING "%s: discarding partial skb\n", |
60 | __func__); |
61 | return; |
62 | } |
63 | |
64 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
65 | if (rlen > skb->len) |
66 | rlen = skb->len; |
67 | |
68 | if (nlh->nlmsg_type != SCSI_TRANSPORT_MSG) { |
69 | err = -EBADMSG; |
70 | goto next_msg; |
71 | } |
72 | |
73 | hdr = NLMSG_DATA(nlh); |
74 | if ((hdr->version != SCSI_NL_VERSION) || |
75 | (hdr->magic != SCSI_NL_MAGIC)) { |
76 | err = -EPROTOTYPE; |
77 | goto next_msg; |
78 | } |
79 | |
80 | if (!capable(CAP_SYS_ADMIN)) { |
81 | err = -EPERM; |
82 | goto next_msg; |
83 | } |
84 | |
85 | if (nlh->nlmsg_len < (sizeof(*nlh) + hdr->msglen)) { |
86 | printk(KERN_WARNING "%s: discarding partial message\n", |
87 | __func__); |
88 | goto next_msg; |
89 | } |
90 | |
91 | /* |
92 | * Deliver message to the appropriate transport |
93 | */ |
94 | tport = hdr->transport; |
95 | if (tport == SCSI_NL_TRANSPORT) { |
96 | switch (hdr->msgtype) { |
97 | case SCSI_NL_SHOST_VENDOR: |
98 | /* Locate the driver that corresponds to the message */ |
99 | err = -ESRCH; |
100 | break; |
101 | default: |
102 | err = -EBADR; |
103 | break; |
104 | } |
105 | if (err) |
106 | printk(KERN_WARNING "%s: Msgtype %d failed - err %d\n", |
107 | __func__, hdr->msgtype, err); |
108 | } |
109 | else |
110 | err = -ENOENT; |
111 | |
112 | next_msg: |
113 | if ((err) || (nlh->nlmsg_flags & NLM_F_ACK)) |
114 | netlink_ack(skb, nlh, err); |
115 | |
116 | skb_pull(skb, rlen); |
117 | } |
118 | } |
119 | |
120 | /** |
121 | * scsi_netlink_init - Called by SCSI subsystem to initialize |
122 | * the SCSI transport netlink interface |
123 | * |
124 | **/ |
125 | void |
126 | scsi_netlink_init(void) |
127 | { |
128 | struct netlink_kernel_cfg cfg = { |
129 | .input = scsi_nl_rcv_msg, |
130 | .groups = SCSI_NL_GRP_CNT, |
131 | }; |
132 | |
133 | scsi_nl_sock = netlink_kernel_create(&init_net, NETLINK_SCSITRANSPORT, |
134 | &cfg); |
135 | if (!scsi_nl_sock) { |
136 | printk(KERN_ERR "%s: register of receive handler failed\n", |
137 | __func__); |
138 | return; |
139 | } |
140 | |
141 | return; |
142 | } |
143 | |
144 | |
145 | /** |
146 | * scsi_netlink_exit - Called by SCSI subsystem to disable the SCSI transport netlink interface |
147 | * |
148 | **/ |
149 | void |
150 | scsi_netlink_exit(void) |
151 | { |
152 | if (scsi_nl_sock) { |
153 | netlink_kernel_release(scsi_nl_sock); |
154 | } |
155 | |
156 | return; |
157 | } |
158 | |
159 |
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