Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Netlink event notifications for SELinux. | |
4 | * | |
5 | * Author: James Morris <jmorris@redhat.com> | |
6 | * | |
7 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
1da177e4 LT |
8 | */ |
9 | #include <linux/init.h> | |
10 | #include <linux/types.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
1da177e4 LT |
12 | #include <linux/stddef.h> |
13 | #include <linux/kernel.h> | |
44fc7ea0 | 14 | #include <linux/export.h> |
1da177e4 | 15 | #include <linux/skbuff.h> |
1da177e4 | 16 | #include <linux/selinux_netlink.h> |
b4b51029 | 17 | #include <net/net_namespace.h> |
01f534d0 | 18 | #include <net/netlink.h> |
1da177e4 | 19 | |
6a3fbe81 JM |
20 | #include "security.h" |
21 | ||
cd2bb4cb | 22 | static struct sock *selnl __ro_after_init; |
1da177e4 LT |
23 | |
24 | static int selnl_msglen(int msgtype) | |
25 | { | |
26 | int ret = 0; | |
c544c028 | 27 | |
1da177e4 LT |
28 | switch (msgtype) { |
29 | case SELNL_MSG_SETENFORCE: | |
30 | ret = sizeof(struct selnl_msg_setenforce); | |
31 | break; | |
c544c028 | 32 | |
1da177e4 LT |
33 | case SELNL_MSG_POLICYLOAD: |
34 | ret = sizeof(struct selnl_msg_policyload); | |
35 | break; | |
c544c028 | 36 | |
1da177e4 LT |
37 | default: |
38 | BUG(); | |
39 | } | |
40 | return ret; | |
41 | } | |
42 | ||
43 | static void selnl_add_payload(struct nlmsghdr *nlh, int len, int msgtype, void *data) | |
44 | { | |
45 | switch (msgtype) { | |
46 | case SELNL_MSG_SETENFORCE: { | |
01f534d0 | 47 | struct selnl_msg_setenforce *msg = nlmsg_data(nlh); |
c544c028 | 48 | |
1da177e4 LT |
49 | memset(msg, 0, len); |
50 | msg->val = *((int *)data); | |
51 | break; | |
52 | } | |
c544c028 | 53 | |
1da177e4 | 54 | case SELNL_MSG_POLICYLOAD: { |
01f534d0 | 55 | struct selnl_msg_policyload *msg = nlmsg_data(nlh); |
c544c028 | 56 | |
1da177e4 LT |
57 | memset(msg, 0, len); |
58 | msg->seqno = *((u32 *)data); | |
59 | break; | |
60 | } | |
61 | ||
62 | default: | |
63 | BUG(); | |
64 | } | |
65 | } | |
66 | ||
67 | static void selnl_notify(int msgtype, void *data) | |
68 | { | |
69 | int len; | |
27a884dc | 70 | sk_buff_data_t tmp; |
1da177e4 LT |
71 | struct sk_buff *skb; |
72 | struct nlmsghdr *nlh; | |
c544c028 | 73 | |
1da177e4 | 74 | len = selnl_msglen(msgtype); |
c544c028 | 75 | |
77954983 | 76 | skb = nlmsg_new(len, GFP_USER); |
1da177e4 LT |
77 | if (!skb) |
78 | goto oom; | |
79 | ||
80 | tmp = skb->tail; | |
01f534d0 DM |
81 | nlh = nlmsg_put(skb, 0, 0, msgtype, len, 0); |
82 | if (!nlh) | |
83 | goto out_kfree_skb; | |
1da177e4 LT |
84 | selnl_add_payload(nlh, len, msgtype, data); |
85 | nlh->nlmsg_len = skb->tail - tmp; | |
ac6d439d PM |
86 | NETLINK_CB(skb).dst_group = SELNLGRP_AVC; |
87 | netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER); | |
1da177e4 LT |
88 | out: |
89 | return; | |
c544c028 | 90 | |
01f534d0 | 91 | out_kfree_skb: |
1da177e4 LT |
92 | kfree_skb(skb); |
93 | oom: | |
d85a7833 | 94 | pr_err("SELinux: OOM in %s\n", __func__); |
1da177e4 LT |
95 | goto out; |
96 | } | |
97 | ||
98 | void selnl_notify_setenforce(int val) | |
99 | { | |
100 | selnl_notify(SELNL_MSG_SETENFORCE, &val); | |
101 | } | |
102 | ||
103 | void selnl_notify_policyload(u32 seqno) | |
104 | { | |
105 | selnl_notify(SELNL_MSG_POLICYLOAD, &seqno); | |
106 | } | |
107 | ||
108 | static int __init selnl_init(void) | |
109 | { | |
a31f2d17 PNA |
110 | struct netlink_kernel_cfg cfg = { |
111 | .groups = SELNLGRP_MAX, | |
9785e10a | 112 | .flags = NL_CFG_F_NONROOT_RECV, |
a31f2d17 PNA |
113 | }; |
114 | ||
9f00d977 | 115 | selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX, &cfg); |
1da177e4 LT |
116 | if (selnl == NULL) |
117 | panic("SELinux: Cannot create netlink socket."); | |
1da177e4 LT |
118 | return 0; |
119 | } | |
120 | ||
121 | __initcall(selnl_init); |