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![Jan Engelhardt](/assets/img/avatar_default.png)
Lots of extensions are completely family-independent, so squash some code. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
201 lines
4.8 KiB
C
201 lines
4.8 KiB
C
/*
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* xt_MARK - Netfilter module to modify the NFMARK field of an skb
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*
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* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
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* Copyright © CC Computer Consultants GmbH, 2007 - 2008
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* Jan Engelhardt <jengelh@computergmbh.de>
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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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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <net/checksum.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_MARK.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
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MODULE_DESCRIPTION("Xtables: packet mark modification");
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MODULE_ALIAS("ipt_MARK");
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MODULE_ALIAS("ip6t_MARK");
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static unsigned int
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mark_tg_v0(struct sk_buff *skb, const struct xt_target_param *par)
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{
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const struct xt_mark_target_info *markinfo = par->targinfo;
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skb->mark = markinfo->mark;
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return XT_CONTINUE;
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}
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static unsigned int
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mark_tg_v1(struct sk_buff *skb, const struct xt_target_param *par)
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{
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const struct xt_mark_target_info_v1 *markinfo = par->targinfo;
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int mark = 0;
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switch (markinfo->mode) {
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case XT_MARK_SET:
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mark = markinfo->mark;
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break;
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case XT_MARK_AND:
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mark = skb->mark & markinfo->mark;
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break;
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case XT_MARK_OR:
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mark = skb->mark | markinfo->mark;
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break;
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}
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skb->mark = mark;
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return XT_CONTINUE;
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}
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static unsigned int
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mark_tg(struct sk_buff *skb, const struct xt_target_param *par)
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{
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const struct xt_mark_tginfo2 *info = par->targinfo;
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skb->mark = (skb->mark & ~info->mask) ^ info->mark;
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return XT_CONTINUE;
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}
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static bool mark_tg_check_v0(const struct xt_tgchk_param *par)
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{
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const struct xt_mark_target_info *markinfo = par->targinfo;
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if (markinfo->mark > 0xffffffff) {
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printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
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return false;
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}
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return true;
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}
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static bool mark_tg_check_v1(const struct xt_tgchk_param *par)
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{
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const struct xt_mark_target_info_v1 *markinfo = par->targinfo;
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if (markinfo->mode != XT_MARK_SET
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&& markinfo->mode != XT_MARK_AND
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&& markinfo->mode != XT_MARK_OR) {
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printk(KERN_WARNING "MARK: unknown mode %u\n",
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markinfo->mode);
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return false;
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}
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if (markinfo->mark > 0xffffffff) {
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printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
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return false;
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}
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return true;
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}
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#ifdef CONFIG_COMPAT
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struct compat_xt_mark_target_info {
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compat_ulong_t mark;
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};
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static void mark_tg_compat_from_user_v0(void *dst, void *src)
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{
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const struct compat_xt_mark_target_info *cm = src;
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struct xt_mark_target_info m = {
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.mark = cm->mark,
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};
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memcpy(dst, &m, sizeof(m));
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}
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static int mark_tg_compat_to_user_v0(void __user *dst, void *src)
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{
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const struct xt_mark_target_info *m = src;
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struct compat_xt_mark_target_info cm = {
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.mark = m->mark,
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};
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return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
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}
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struct compat_xt_mark_target_info_v1 {
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compat_ulong_t mark;
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u_int8_t mode;
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u_int8_t __pad1;
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u_int16_t __pad2;
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};
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static void mark_tg_compat_from_user_v1(void *dst, void *src)
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{
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const struct compat_xt_mark_target_info_v1 *cm = src;
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struct xt_mark_target_info_v1 m = {
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.mark = cm->mark,
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.mode = cm->mode,
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};
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memcpy(dst, &m, sizeof(m));
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}
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static int mark_tg_compat_to_user_v1(void __user *dst, void *src)
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{
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const struct xt_mark_target_info_v1 *m = src;
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struct compat_xt_mark_target_info_v1 cm = {
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.mark = m->mark,
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.mode = m->mode,
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};
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return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
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}
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#endif /* CONFIG_COMPAT */
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static struct xt_target mark_tg_reg[] __read_mostly = {
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{
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.name = "MARK",
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.family = NFPROTO_UNSPEC,
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.revision = 0,
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.checkentry = mark_tg_check_v0,
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.target = mark_tg_v0,
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.targetsize = sizeof(struct xt_mark_target_info),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_xt_mark_target_info),
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.compat_from_user = mark_tg_compat_from_user_v0,
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.compat_to_user = mark_tg_compat_to_user_v0,
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#endif
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.table = "mangle",
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.me = THIS_MODULE,
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},
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{
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.name = "MARK",
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.family = NFPROTO_UNSPEC,
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.revision = 1,
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.checkentry = mark_tg_check_v1,
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.target = mark_tg_v1,
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.targetsize = sizeof(struct xt_mark_target_info_v1),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_xt_mark_target_info_v1),
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.compat_from_user = mark_tg_compat_from_user_v1,
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.compat_to_user = mark_tg_compat_to_user_v1,
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#endif
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.table = "mangle",
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.me = THIS_MODULE,
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},
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{
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.name = "MARK",
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.revision = 2,
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.family = NFPROTO_UNSPEC,
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.target = mark_tg,
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.targetsize = sizeof(struct xt_mark_tginfo2),
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.me = THIS_MODULE,
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},
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};
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static int __init mark_tg_init(void)
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{
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return xt_register_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
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}
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static void __exit mark_tg_exit(void)
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{
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xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
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}
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module_init(mark_tg_init);
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module_exit(mark_tg_exit);
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