2ae15b64e6
Updates the MODULE_DESCRIPTION() tags for all Netfilter modules, actually describing what the module does and not just "netfilter XYZ target". Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/*
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* xt_mark - Netfilter module to match NFMARK value
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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/netfilter/xt_mark.h>
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#include <linux/netfilter/x_tables.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 match");
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MODULE_ALIAS("ipt_mark");
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MODULE_ALIAS("ip6t_mark");
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static bool
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mark_mt_v0(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff,
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bool *hotdrop)
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{
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const struct xt_mark_info *info = matchinfo;
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return ((skb->mark & info->mask) == info->mark) ^ info->invert;
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}
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static bool
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mark_mt(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop)
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{
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const struct xt_mark_mtinfo1 *info = matchinfo;
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return ((skb->mark & info->mask) == info->mark) ^ info->invert;
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}
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static bool
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mark_mt_check_v0(const char *tablename, const void *entry,
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const struct xt_match *match, void *matchinfo,
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unsigned int hook_mask)
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{
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const struct xt_mark_info *minfo = matchinfo;
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if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) {
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printk(KERN_WARNING "mark: only supports 32bit 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_info {
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compat_ulong_t mark, mask;
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u_int8_t invert;
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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_mt_compat_from_user_v0(void *dst, void *src)
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{
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const struct compat_xt_mark_info *cm = src;
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struct xt_mark_info m = {
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.mark = cm->mark,
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.mask = cm->mask,
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.invert = cm->invert,
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};
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memcpy(dst, &m, sizeof(m));
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}
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static int mark_mt_compat_to_user_v0(void __user *dst, void *src)
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{
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const struct xt_mark_info *m = src;
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struct compat_xt_mark_info cm = {
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.mark = m->mark,
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.mask = m->mask,
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.invert = m->invert,
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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_match mark_mt_reg[] __read_mostly = {
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{
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.name = "mark",
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.revision = 0,
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.family = AF_INET,
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.checkentry = mark_mt_check_v0,
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.match = mark_mt_v0,
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.matchsize = sizeof(struct xt_mark_info),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_xt_mark_info),
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.compat_from_user = mark_mt_compat_from_user_v0,
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.compat_to_user = mark_mt_compat_to_user_v0,
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#endif
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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 = 0,
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.family = AF_INET6,
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.checkentry = mark_mt_check_v0,
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.match = mark_mt_v0,
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.matchsize = sizeof(struct xt_mark_info),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_xt_mark_info),
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.compat_from_user = mark_mt_compat_from_user_v0,
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.compat_to_user = mark_mt_compat_to_user_v0,
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#endif
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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 = 1,
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.family = AF_INET,
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.match = mark_mt,
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.matchsize = sizeof(struct xt_mark_mtinfo1),
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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 = 1,
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.family = AF_INET6,
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.match = mark_mt,
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.matchsize = sizeof(struct xt_mark_mtinfo1),
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.me = THIS_MODULE,
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},
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};
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static int __init mark_mt_init(void)
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{
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return xt_register_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg));
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}
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static void __exit mark_mt_exit(void)
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{
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xt_unregister_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg));
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}
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module_init(mark_mt_init);
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module_exit(mark_mt_exit);
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