ia64/linux-2.6.18-xen.hg

view net/netfilter/xt_SECMARK.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
1 /*
2 * Module for modifying the secmark field of the skb, for use by
3 * security subsystems.
4 *
5 * Based on the nfmark match by:
6 * (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
7 *
8 * (C) 2006 Red Hat, Inc., James Morris <jmorris@redhat.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 */
15 #include <linux/module.h>
16 #include <linux/skbuff.h>
17 #include <linux/selinux.h>
18 #include <linux/netfilter/x_tables.h>
19 #include <linux/netfilter/xt_SECMARK.h>
21 MODULE_LICENSE("GPL");
22 MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
23 MODULE_DESCRIPTION("ip[6]tables SECMARK modification module");
24 MODULE_ALIAS("ipt_SECMARK");
25 MODULE_ALIAS("ip6t_SECMARK");
27 #define PFX "SECMARK: "
29 static u8 mode;
31 static unsigned int target(struct sk_buff **pskb, const struct net_device *in,
32 const struct net_device *out, unsigned int hooknum,
33 const struct xt_target *target,
34 const void *targinfo, void *userinfo)
35 {
36 u32 secmark = 0;
37 const struct xt_secmark_target_info *info = targinfo;
39 BUG_ON(info->mode != mode);
41 switch (mode) {
42 case SECMARK_MODE_SEL:
43 secmark = info->u.sel.selsid;
44 break;
46 default:
47 BUG();
48 }
50 if ((*pskb)->secmark != secmark)
51 (*pskb)->secmark = secmark;
53 return XT_CONTINUE;
54 }
56 static int checkentry_selinux(struct xt_secmark_target_info *info)
57 {
58 int err;
59 struct xt_secmark_target_selinux_info *sel = &info->u.sel;
61 sel->selctx[SECMARK_SELCTX_MAX - 1] = '\0';
63 err = selinux_string_to_sid(sel->selctx, &sel->selsid);
64 if (err) {
65 if (err == -EINVAL)
66 printk(KERN_INFO PFX "invalid SELinux context \'%s\'\n",
67 sel->selctx);
68 return 0;
69 }
71 if (!sel->selsid) {
72 printk(KERN_INFO PFX "unable to map SELinux context \'%s\'\n",
73 sel->selctx);
74 return 0;
75 }
77 err = selinux_relabel_packet_permission(sel->selsid);
78 if (err) {
79 printk(KERN_INFO PFX "unable to obtain relabeling permission\n");
80 return 0;
81 }
83 return 1;
84 }
86 static int checkentry(const char *tablename, const void *entry,
87 const struct xt_target *target, void *targinfo,
88 unsigned int targinfosize, unsigned int hook_mask)
89 {
90 struct xt_secmark_target_info *info = targinfo;
92 if (mode && mode != info->mode) {
93 printk(KERN_INFO PFX "mode already set to %hu cannot mix with "
94 "rules for mode %hu\n", mode, info->mode);
95 return 0;
96 }
98 switch (info->mode) {
99 case SECMARK_MODE_SEL:
100 if (!checkentry_selinux(info))
101 return 0;
102 break;
104 default:
105 printk(KERN_INFO PFX "invalid mode: %hu\n", info->mode);
106 return 0;
107 }
109 if (!mode)
110 mode = info->mode;
111 return 1;
112 }
114 static struct xt_target ipt_secmark_reg = {
115 .name = "SECMARK",
116 .target = target,
117 .targetsize = sizeof(struct xt_secmark_target_info),
118 .table = "mangle",
119 .checkentry = checkentry,
120 .me = THIS_MODULE,
121 .family = AF_INET,
122 .revision = 0,
123 };
125 static struct xt_target ip6t_secmark_reg = {
126 .name = "SECMARK",
127 .target = target,
128 .targetsize = sizeof(struct xt_secmark_target_info),
129 .table = "mangle",
130 .checkentry = checkentry,
131 .me = THIS_MODULE,
132 .family = AF_INET6,
133 .revision = 0,
134 };
136 static int __init xt_secmark_init(void)
137 {
138 int err;
140 err = xt_register_target(&ipt_secmark_reg);
141 if (err)
142 return err;
144 err = xt_register_target(&ip6t_secmark_reg);
145 if (err)
146 xt_unregister_target(&ipt_secmark_reg);
148 return err;
149 }
151 static void __exit xt_secmark_fini(void)
152 {
153 xt_unregister_target(&ip6t_secmark_reg);
154 xt_unregister_target(&ipt_secmark_reg);
155 }
157 module_init(xt_secmark_init);
158 module_exit(xt_secmark_fini);