2006-06-09 09:30:57 +02:00
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/*
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* Module for modifying the secmark field of the skb, for use by
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* security subsystems.
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*
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* Based on the nfmark match by:
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* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
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*
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2008-06-10 00:57:24 +02:00
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* (C) 2006,2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
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2006-06-09 09:30:57 +02:00
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/selinux.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_SECMARK.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
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2008-01-15 08:42:28 +01:00
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MODULE_DESCRIPTION("Xtables: packet security mark modification");
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2006-06-09 09:30:57 +02:00
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MODULE_ALIAS("ipt_SECMARK");
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MODULE_ALIAS("ip6t_SECMARK");
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#define PFX "SECMARK: "
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static u8 mode;
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2007-12-05 08:24:03 +01:00
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static unsigned int
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secmark_tg(struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, unsigned int hooknum,
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const struct xt_target *target, const void *targinfo)
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2006-06-09 09:30:57 +02:00
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{
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u32 secmark = 0;
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const struct xt_secmark_target_info *info = targinfo;
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BUG_ON(info->mode != mode);
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switch (mode) {
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case SECMARK_MODE_SEL:
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secmark = info->u.sel.selsid;
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break;
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default:
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BUG();
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}
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2007-10-15 09:53:15 +02:00
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skb->secmark = secmark;
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2006-06-09 09:30:57 +02:00
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return XT_CONTINUE;
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}
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2007-07-08 07:16:26 +02:00
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static bool checkentry_selinux(struct xt_secmark_target_info *info)
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2006-06-09 09:30:57 +02:00
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{
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int err;
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struct xt_secmark_target_selinux_info *sel = &info->u.sel;
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2007-02-12 20:15:49 +01:00
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2006-07-31 05:46:38 +02:00
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sel->selctx[SECMARK_SELCTX_MAX - 1] = '\0';
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2006-06-09 09:30:57 +02:00
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err = selinux_string_to_sid(sel->selctx, &sel->selsid);
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if (err) {
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if (err == -EINVAL)
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printk(KERN_INFO PFX "invalid SELinux context \'%s\'\n",
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sel->selctx);
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2007-07-08 07:16:26 +02:00
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return false;
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2006-06-09 09:30:57 +02:00
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}
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if (!sel->selsid) {
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printk(KERN_INFO PFX "unable to map SELinux context \'%s\'\n",
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sel->selctx);
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2007-07-08 07:16:26 +02:00
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return false;
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2006-06-09 09:30:57 +02:00
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}
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2008-01-29 14:43:36 +01:00
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err = selinux_secmark_relabel_packet_permission(sel->selsid);
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2006-06-09 09:30:57 +02:00
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if (err) {
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printk(KERN_INFO PFX "unable to obtain relabeling permission\n");
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2007-07-08 07:16:26 +02:00
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return false;
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2006-06-09 09:30:57 +02:00
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}
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2008-01-29 14:43:36 +01:00
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selinux_secmark_refcount_inc();
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2007-07-08 07:16:26 +02:00
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return true;
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2006-06-09 09:30:57 +02:00
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}
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2007-12-05 08:24:03 +01:00
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static bool
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secmark_tg_check(const char *tablename, const void *entry,
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const struct xt_target *target, void *targinfo,
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unsigned int hook_mask)
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2006-06-09 09:30:57 +02:00
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{
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struct xt_secmark_target_info *info = targinfo;
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2008-06-10 00:57:24 +02:00
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if (strcmp(tablename, "mangle") && strcmp(tablename, "security")) {
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printk(KERN_INFO PFX "target only valid in the \'mangle\' "
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"or \'security\' tables, not \'%s\'.\n", tablename);
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return false;
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}
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2006-06-09 09:30:57 +02:00
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if (mode && mode != info->mode) {
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printk(KERN_INFO PFX "mode already set to %hu cannot mix with "
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"rules for mode %hu\n", mode, info->mode);
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2007-07-08 07:16:26 +02:00
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return false;
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2006-06-09 09:30:57 +02:00
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}
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switch (info->mode) {
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case SECMARK_MODE_SEL:
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if (!checkentry_selinux(info))
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2007-07-08 07:16:26 +02:00
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return false;
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2006-06-09 09:30:57 +02:00
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break;
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default:
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printk(KERN_INFO PFX "invalid mode: %hu\n", info->mode);
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2007-07-08 07:16:26 +02:00
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return false;
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2006-06-09 09:30:57 +02:00
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}
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if (!mode)
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mode = info->mode;
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2007-07-08 07:16:26 +02:00
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return true;
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2006-06-09 09:30:57 +02:00
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}
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2008-02-14 02:41:39 +01:00
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static void secmark_tg_destroy(const struct xt_target *target, void *targinfo)
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2008-01-29 14:43:36 +01:00
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{
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switch (mode) {
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case SECMARK_MODE_SEL:
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selinux_secmark_refcount_dec();
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}
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}
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2007-12-05 08:24:03 +01:00
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static struct xt_target secmark_tg_reg[] __read_mostly = {
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2006-08-22 09:34:04 +02:00
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{
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.name = "SECMARK",
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2008-10-08 11:35:01 +02:00
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.family = NFPROTO_IPV4,
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2007-12-05 08:24:03 +01:00
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.checkentry = secmark_tg_check,
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2008-01-29 14:43:36 +01:00
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.destroy = secmark_tg_destroy,
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2007-12-05 08:24:03 +01:00
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.target = secmark_tg,
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2006-08-22 09:34:04 +02:00
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.targetsize = sizeof(struct xt_secmark_target_info),
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.me = THIS_MODULE,
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},
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{
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.name = "SECMARK",
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2008-10-08 11:35:01 +02:00
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.family = NFPROTO_IPV6,
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2007-12-05 08:24:03 +01:00
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.checkentry = secmark_tg_check,
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2008-01-29 14:43:36 +01:00
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.destroy = secmark_tg_destroy,
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2007-12-05 08:24:03 +01:00
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.target = secmark_tg,
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2006-08-22 09:34:04 +02:00
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.targetsize = sizeof(struct xt_secmark_target_info),
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.me = THIS_MODULE,
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},
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2006-06-09 09:30:57 +02:00
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};
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2007-12-05 08:24:03 +01:00
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static int __init secmark_tg_init(void)
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2006-06-09 09:30:57 +02:00
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{
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2007-12-05 08:24:03 +01:00
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return xt_register_targets(secmark_tg_reg, ARRAY_SIZE(secmark_tg_reg));
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2006-06-09 09:30:57 +02:00
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}
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2007-12-05 08:24:03 +01:00
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static void __exit secmark_tg_exit(void)
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2006-06-09 09:30:57 +02:00
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{
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2007-12-05 08:24:03 +01:00
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xt_unregister_targets(secmark_tg_reg, ARRAY_SIZE(secmark_tg_reg));
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2006-06-09 09:30:57 +02:00
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}
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2007-12-05 08:24:03 +01:00
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module_init(secmark_tg_init);
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module_exit(secmark_tg_exit);
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