| 1 | |
| 2 | |
| 3 | * xt_mark - Netfilter module to match NFMARK value
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| 4 | *
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| 5 | * (C) 1999-2001 Marc Boucher <[email protected]>
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| 6 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008
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| 7 | * Jan Engelhardt <[email protected]>
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| 8 |
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| 9 |
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| 10 | #include <linux/module.h>
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| 11 | #include <linux/skbuff.h>
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| 12 |
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| 13 | #include <linux/netfilter/xt_mark.h>
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| 14 | #include <linux/netfilter/x_tables.h>
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| 15 |
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| 16 | MODULE_LICENSE("GPL");
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| 17 | MODULE_AUTHOR("Marc Boucher <[email protected]>");
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| 18 | MODULE_DESCRIPTION("Xtables: packet mark operations");
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| 19 | MODULE_ALIAS("ipt_mark");
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| 20 | MODULE_ALIAS("ip6t_mark");
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| 21 | MODULE_ALIAS("ipt_MARK");
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| 22 | MODULE_ALIAS("ip6t_MARK");
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| 23 | MODULE_ALIAS("arpt_MARK");
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| 24 |
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| 25 | static unsigned int
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| 26 | mark_tg(struct sk_buff *skb, const struct xt_action_param *par)
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| 27 | {
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| 28 | const struct xt_mark_tginfo2 *info = par->targinfo;
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| 29 |
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| 30 | skb->mark = (skb->mark & ~info->mask) ^ info->mark;
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| 31 | return XT_CONTINUE;
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| 32 | }
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| 33 |
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| 34 | static bool
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| 35 | mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
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| 36 | {
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| 37 | const struct xt_mark_mtinfo1 *info = par->matchinfo;
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| 38 |
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| 39 | return ((skb->mark & info->mask) == info->mark) ^ info->invert;
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| 40 | }
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| 41 |
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| 42 | static struct xt_target mark_tg_reg[] __read_mostly = {
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| 43 | {
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| 44 | .name = "MARK",
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| 45 | .revision = 2,
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| 46 | .family = NFPROTO_IPV4,
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| 47 | .target = mark_tg,
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| 48 | .targetsize = sizeof(struct xt_mark_tginfo2),
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| 49 | .me = THIS_MODULE,
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| 50 | },
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| 51 | #if IS_ENABLED(CONFIG_IP_NF_ARPTABLES) || IS_ENABLED(CONFIG_NFT_COMPAT_ARP)
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| 52 | {
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| 53 | .name = "MARK",
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| 54 | .revision = 2,
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| 55 | .family = NFPROTO_ARP,
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| 56 | .target = mark_tg,
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| 57 | .targetsize = sizeof(struct xt_mark_tginfo2),
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| 58 | .me = THIS_MODULE,
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| 59 | },
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| 60 | #endif
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| 61 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
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| 62 | {
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| 63 | .name = "MARK",
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| 64 | .revision = 2,
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| 65 | .family = NFPROTO_IPV6,
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| 66 | .target = mark_tg,
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| 67 | .targetsize = sizeof(struct xt_mark_tginfo2),
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| 68 | .me = THIS_MODULE,
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| 69 | },
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| 70 | #endif
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| 71 | };
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| 72 |
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| 73 | static struct xt_match mark_mt_reg __read_mostly = {
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| 74 | .name = "mark",
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| 75 | .revision = 1,
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| 76 | .family = NFPROTO_UNSPEC,
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| 77 | .match = mark_mt,
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| 78 | .matchsize = sizeof(struct xt_mark_mtinfo1),
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| 79 | .me = THIS_MODULE,
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| 80 | };
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| 81 |
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| 82 | static int __init mark_mt_init(void)
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| 83 | {
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| 84 | int ret;
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| 85 |
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| 86 | ret = xt_register_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
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| 87 | if (ret < 0)
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| 88 | return ret;
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| 89 | ret = xt_register_match(&mark_mt_reg);
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| 90 | if (ret < 0) {
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| 91 | xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
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| 92 | return ret;
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| 93 | }
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| 94 | return 0;
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| 95 | }
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| 96 |
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| 97 | static void __exit mark_mt_exit(void)
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| 98 | {
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| 99 | xt_unregister_match(&mark_mt_reg);
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| 100 | xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
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| 101 | }
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| 102 |
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| 103 | module_init(mark_mt_init);
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| 104 | module_exit(mark_mt_exit);
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