nfsd4: typo logical vs bitwise negate for want_mask
[linux-btrfs-devel.git] / net / netfilter / xt_dscp.c
blob64670fc5d0e1a581f4e3b3885d8117c7a70b0edb
1 /* IP tables module for matching the value of the IPv4/IPv6 DSCP field
3 * (C) 2002 by Harald Welte <laforge@netfilter.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/module.h>
11 #include <linux/skbuff.h>
12 #include <linux/ip.h>
13 #include <linux/ipv6.h>
14 #include <net/dsfield.h>
16 #include <linux/netfilter/x_tables.h>
17 #include <linux/netfilter/xt_dscp.h>
19 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
20 MODULE_DESCRIPTION("Xtables: DSCP/TOS field match");
21 MODULE_LICENSE("GPL");
22 MODULE_ALIAS("ipt_dscp");
23 MODULE_ALIAS("ip6t_dscp");
24 MODULE_ALIAS("ipt_tos");
25 MODULE_ALIAS("ip6t_tos");
27 static bool
28 dscp_mt(const struct sk_buff *skb, struct xt_action_param *par)
30 const struct xt_dscp_info *info = par->matchinfo;
31 u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
33 return (dscp == info->dscp) ^ !!info->invert;
36 static bool
37 dscp_mt6(const struct sk_buff *skb, struct xt_action_param *par)
39 const struct xt_dscp_info *info = par->matchinfo;
40 u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
42 return (dscp == info->dscp) ^ !!info->invert;
45 static int dscp_mt_check(const struct xt_mtchk_param *par)
47 const struct xt_dscp_info *info = par->matchinfo;
49 if (info->dscp > XT_DSCP_MAX) {
50 pr_info("dscp %x out of range\n", info->dscp);
51 return -EDOM;
54 return 0;
57 static bool tos_mt(const struct sk_buff *skb, struct xt_action_param *par)
59 const struct xt_tos_match_info *info = par->matchinfo;
61 if (par->family == NFPROTO_IPV4)
62 return ((ip_hdr(skb)->tos & info->tos_mask) ==
63 info->tos_value) ^ !!info->invert;
64 else
65 return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) ==
66 info->tos_value) ^ !!info->invert;
69 static struct xt_match dscp_mt_reg[] __read_mostly = {
71 .name = "dscp",
72 .family = NFPROTO_IPV4,
73 .checkentry = dscp_mt_check,
74 .match = dscp_mt,
75 .matchsize = sizeof(struct xt_dscp_info),
76 .me = THIS_MODULE,
79 .name = "dscp",
80 .family = NFPROTO_IPV6,
81 .checkentry = dscp_mt_check,
82 .match = dscp_mt6,
83 .matchsize = sizeof(struct xt_dscp_info),
84 .me = THIS_MODULE,
87 .name = "tos",
88 .revision = 1,
89 .family = NFPROTO_IPV4,
90 .match = tos_mt,
91 .matchsize = sizeof(struct xt_tos_match_info),
92 .me = THIS_MODULE,
95 .name = "tos",
96 .revision = 1,
97 .family = NFPROTO_IPV6,
98 .match = tos_mt,
99 .matchsize = sizeof(struct xt_tos_match_info),
100 .me = THIS_MODULE,
104 static int __init dscp_mt_init(void)
106 return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
109 static void __exit dscp_mt_exit(void)
111 xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
114 module_init(dscp_mt_init);
115 module_exit(dscp_mt_exit);