| | 1 | /* IP tables module for matching the value of the IPv4/IPv6 DSCP field |
| | 2 | * |
| | 3 | * (C) 2002 by Harald Welte <laforge@netfilter.org> |
| | 4 | * |
| | 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> |
| | 15 | |
| | 16 | #include <linux/netfilter/x_tables.h> |
| | 17 | #include <linux/netfilter/xt_dscp.h> |
| | 18 | |
| | 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"); |
| | 26 | |
| | 27 | static bool |
| | 28 | dscp_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| | 29 | { |
| | 30 | const struct xt_dscp_info *info = par->matchinfo; |
| | 31 | u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT; |
| | 32 | |
| | 33 | return (dscp == info->dscp) ^ !!info->invert; |
| | 34 | } |
| | 35 | |
| | 36 | static bool |
| | 37 | dscp_mt6(const struct sk_buff *skb, struct xt_action_param *par) |
| | 38 | { |
| | 39 | const struct xt_dscp_info *info = par->matchinfo; |
| | 40 | u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT; |
| | 41 | |
| | 42 | return (dscp == info->dscp) ^ !!info->invert; |
| | 43 | } |
| | 44 | |
| | 45 | static int dscp_mt_check(const struct xt_mtchk_param *par) |
| | 46 | { |
| | 47 | const struct xt_dscp_info *info = par->matchinfo; |
| | 48 | |
| | 49 | if (info->dscp > XT_DSCP_MAX) { |
| | 50 | pr_info("dscp %x out of range\n", info->dscp); |
| | 51 | return -EDOM; |
| | 52 | } |
| | 53 | |
| | 54 | return 0; |
| | 55 | } |
| | 56 | |
| | 57 | static bool tos_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| | 58 | { |
| | 59 | const struct xt_tos_match_info *info = par->matchinfo; |
| | 60 | |
| | 61 | if (xt_family(par) == 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; |
| | 67 | } |
| | 68 | |
| | 69 | static struct xt_match dscp_mt_reg[] __read_mostly = { |
| | 70 | { |
| | 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, |
| | 77 | }, |
| | 78 | { |
| | 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, |
| | 85 | }, |
| | 86 | { |
| | 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, |
| | 93 | }, |
| | 94 | { |
| | 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, |
| | 101 | }, |
| | 102 | }; |
| | 103 | |
| | 104 | static int __init dscp_mt_init(void) |
| | 105 | { |
| | 106 | return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
| | 107 | } |
| | 108 | |
| | 109 | static void __exit dscp_mt_exit(void) |
| | 110 | { |
| | 111 | xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
| | 112 | } |
| | 113 | |
| | 114 | module_init(dscp_mt_init); |
| | 115 | module_exit(dscp_mt_exit); |
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / blame_incremental