1fe5723773
Old userspace doesn't support revision 1, especially for IPv6, which is only available in the SVN snapshot. Add compat support for revision 0. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
222 lines
5.4 KiB
C
222 lines
5.4 KiB
C
/* This is a module which is used for setting the NFMARK field of an skb. */
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/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
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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("ip[6]tables MARK modification module");
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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 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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{
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const struct xt_mark_target_info *markinfo = 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(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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{
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const struct xt_mark_target_info_v1 *markinfo = 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 bool
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mark_tg_check_v0(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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{
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const struct xt_mark_target_info *markinfo = 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
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mark_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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{
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const struct xt_mark_target_info_v1 *markinfo = 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(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(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 = AF_INET,
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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,
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.compat_to_user = mark_tg_compat_to_user,
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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 = AF_INET,
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.revision = 1,
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.checkentry = mark_tg_check,
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.target = mark_tg,
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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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.family = AF_INET6,
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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,
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.compat_to_user = mark_tg_compat_to_user,
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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 = AF_INET6,
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.revision = 1,
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.checkentry = mark_tg_check,
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.target = mark_tg,
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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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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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