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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | /* IP tables module for matching the value of the IPv4/IPv6 DSCP field * * (C) 2002 by Harald Welte <laforge@netfilter.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/skbuff.h> #include <linux/ip.h> #include <linux/ipv6.h> #include <net/dsfield.h> #include <linux/netfilter/x_tables.h> #include <linux/netfilter/xt_dscp.h> MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); MODULE_DESCRIPTION("Xtables: DSCP/TOS field match"); MODULE_LICENSE("GPL"); MODULE_ALIAS("ipt_dscp"); MODULE_ALIAS("ip6t_dscp"); MODULE_ALIAS("ipt_tos"); MODULE_ALIAS("ip6t_tos"); static bool dscp_mt(const struct sk_buff *skb, struct xt_action_param *par) { const struct xt_dscp_info *info = par->matchinfo; u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT; return (dscp == info->dscp) ^ !!info->invert; } static bool dscp_mt6(const struct sk_buff *skb, struct xt_action_param *par) { const struct xt_dscp_info *info = par->matchinfo; u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT; return (dscp == info->dscp) ^ !!info->invert; } static int dscp_mt_check(const struct xt_mtchk_param *par) { const struct xt_dscp_info *info = par->matchinfo; if (info->dscp > XT_DSCP_MAX) return -EDOM; return 0; } static bool tos_mt(const struct sk_buff *skb, struct xt_action_param *par) { const struct xt_tos_match_info *info = par->matchinfo; if (xt_family(par) == NFPROTO_IPV4) return ((ip_hdr(skb)->tos & info->tos_mask) == info->tos_value) ^ !!info->invert; else return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) == info->tos_value) ^ !!info->invert; } static struct xt_match dscp_mt_reg[] __read_mostly = { { .name = "dscp", .family = NFPROTO_IPV4, .checkentry = dscp_mt_check, .match = dscp_mt, .matchsize = sizeof(struct xt_dscp_info), .me = THIS_MODULE, }, { .name = "dscp", .family = NFPROTO_IPV6, .checkentry = dscp_mt_check, .match = dscp_mt6, .matchsize = sizeof(struct xt_dscp_info), .me = THIS_MODULE, }, { .name = "tos", .revision = 1, .family = NFPROTO_IPV4, .match = tos_mt, .matchsize = sizeof(struct xt_tos_match_info), .me = THIS_MODULE, }, { .name = "tos", .revision = 1, .family = NFPROTO_IPV6, .match = tos_mt, .matchsize = sizeof(struct xt_tos_match_info), .me = THIS_MODULE, }, }; static int __init dscp_mt_init(void) { return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); } static void __exit dscp_mt_exit(void) { xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); } module_init(dscp_mt_init); module_exit(dscp_mt_exit); |