Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 1 | /* Shared library add-on to iptables for DSCP |
| 2 | * |
| 3 | * (C) 2000- 2002 by Matthew G. Marsh <mgm@paktronix.com>, |
| 4 | * Harald Welte <laforge@gnumonks.org> |
| 5 | * |
| 6 | * This program is distributed under the terms of GNU GPL v2, 1991 |
| 7 | * |
| 8 | * libipt_DSCP.c borrowed heavily from libipt_TOS.c |
| 9 | * |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 10 | * --set-class added by Iain Barnes |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 11 | */ |
| 12 | #include <stdio.h> |
| 13 | #include <string.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <getopt.h> |
| 16 | |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 17 | #include <xtables.h> |
| 18 | #include <linux/netfilter/x_tables.h> |
| 19 | #include <linux/netfilter/xt_DSCP.h> |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 20 | |
Iain Barnes | 0ddae8f | 2002-06-21 17:35:55 +0000 | [diff] [blame] | 21 | /* This is evil, but it's my code - HW*/ |
Jan Engelhardt | f82070f | 2008-01-20 13:14:00 +0000 | [diff] [blame] | 22 | #include "dscp_helper.c" |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 23 | |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 24 | static void DSCP_help(void) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 25 | { |
| 26 | printf( |
| 27 | "DSCP target options\n" |
| 28 | " --set-dscp value Set DSCP field in packet header to value\n" |
| 29 | " This value can be in decimal (ex: 32)\n" |
| 30 | " or in hex (ex: 0x20)\n" |
Harald Welte | a49ded0 | 2002-08-07 09:55:37 +0000 | [diff] [blame] | 31 | " --set-dscp-class class Set the DSCP field in packet header to the\n" |
| 32 | " value represented by the DiffServ class value.\n" |
Maciej Soltysiak | 920463d | 2004-03-04 00:14:03 +0000 | [diff] [blame] | 33 | " This class may be EF,BE or any of the CSxx\n" |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 34 | " or AFxx classes.\n" |
| 35 | "\n" |
| 36 | " These two options are mutually exclusive !\n" |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 37 | ); |
| 38 | } |
| 39 | |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 40 | static const struct option DSCP_opts[] = { |
Patrick McHardy | 500f483 | 2007-09-08 15:59:04 +0000 | [diff] [blame] | 41 | { "set-dscp", 1, NULL, 'F' }, |
| 42 | { "set-dscp-class", 1, NULL, 'G' }, |
Max Kellermann | 9ee386a | 2008-01-29 13:48:05 +0000 | [diff] [blame] | 43 | { .name = NULL } |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 44 | }; |
| 45 | |
| 46 | static void |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 47 | parse_dscp(const char *s, struct xt_DSCP_info *dinfo) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 48 | { |
| 49 | unsigned int dscp; |
| 50 | |
Jan Engelhardt | e917bca | 2009-01-27 18:14:21 +0100 | [diff] [blame^] | 51 | if (string_to_number(s, 0, UINT8_MAX, &dscp) == -1) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 52 | exit_error(PARAMETER_PROBLEM, |
| 53 | "Invalid dscp `%s'\n", s); |
| 54 | |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 55 | if (dscp > XT_DSCP_MAX) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 56 | exit_error(PARAMETER_PROBLEM, |
| 57 | "DSCP `%d` out of range\n", dscp); |
| 58 | |
Jan Engelhardt | 213e185 | 2009-01-27 17:24:34 +0100 | [diff] [blame] | 59 | dinfo->dscp = dscp; |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 60 | } |
| 61 | |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 62 | |
| 63 | static void |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 64 | parse_class(const char *s, struct xt_DSCP_info *dinfo) |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 65 | { |
Iain Barnes | 0ddae8f | 2002-06-21 17:35:55 +0000 | [diff] [blame] | 66 | unsigned int dscp = class_to_dscp(s); |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 67 | |
Iain Barnes | 0ddae8f | 2002-06-21 17:35:55 +0000 | [diff] [blame] | 68 | /* Assign the value */ |
Jan Engelhardt | 213e185 | 2009-01-27 17:24:34 +0100 | [diff] [blame] | 69 | dinfo->dscp = dscp; |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 73 | static int DSCP_parse(int c, char **argv, int invert, unsigned int *flags, |
| 74 | const void *entry, struct xt_entry_target **target) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 75 | { |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 76 | struct xt_DSCP_info *dinfo |
| 77 | = (struct xt_DSCP_info *)(*target)->data; |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 78 | |
| 79 | switch (c) { |
| 80 | case 'F': |
| 81 | if (*flags) |
| 82 | exit_error(PARAMETER_PROBLEM, |
| 83 | "DSCP target: Only use --set-dscp ONCE!"); |
Harald Welte | ed18bad | 2002-02-17 21:28:51 +0000 | [diff] [blame] | 84 | parse_dscp(optarg, dinfo); |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 85 | *flags = 1; |
| 86 | break; |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 87 | case 'G': |
| 88 | if (*flags) |
| 89 | exit_error(PARAMETER_PROBLEM, |
Harald Welte | a49ded0 | 2002-08-07 09:55:37 +0000 | [diff] [blame] | 90 | "DSCP target: Only use --set-dscp-class ONCE!"); |
Iain Barnes | df5e13f | 2002-04-11 10:48:53 +0000 | [diff] [blame] | 91 | parse_class(optarg, dinfo); |
| 92 | *flags = 1; |
| 93 | break; |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 94 | |
| 95 | default: |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | return 1; |
| 100 | } |
| 101 | |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 102 | static void DSCP_check(unsigned int flags) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 103 | { |
| 104 | if (!flags) |
| 105 | exit_error(PARAMETER_PROBLEM, |
| 106 | "DSCP target: Parameter --set-dscp is required"); |
| 107 | } |
| 108 | |
| 109 | static void |
Harald Welte | ed18bad | 2002-02-17 21:28:51 +0000 | [diff] [blame] | 110 | print_dscp(u_int8_t dscp, int numeric) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 111 | { |
| 112 | printf("0x%02x ", dscp); |
| 113 | } |
| 114 | |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 115 | static void DSCP_print(const void *ip, const struct xt_entry_target *target, |
| 116 | int numeric) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 117 | { |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 118 | const struct xt_DSCP_info *dinfo = |
| 119 | (const struct xt_DSCP_info *)target->data; |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 120 | printf("DSCP set "); |
Harald Welte | ed18bad | 2002-02-17 21:28:51 +0000 | [diff] [blame] | 121 | print_dscp(dinfo->dscp, numeric); |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 122 | } |
| 123 | |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 124 | static void DSCP_save(const void *ip, const struct xt_entry_target *target) |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 125 | { |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 126 | const struct xt_DSCP_info *dinfo = |
| 127 | (const struct xt_DSCP_info *)target->data; |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 128 | |
Harald Welte | ed18bad | 2002-02-17 21:28:51 +0000 | [diff] [blame] | 129 | printf("--set-dscp 0x%02x ", dinfo->dscp); |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 130 | } |
| 131 | |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 132 | static struct xtables_target dscp_target = { |
Jan Engelhardt | 03d9948 | 2008-11-18 12:27:54 +0100 | [diff] [blame] | 133 | .family = NFPROTO_IPV4, |
Pablo Neira | 8caee8b | 2004-12-28 13:11:59 +0000 | [diff] [blame] | 134 | .name = "DSCP", |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 135 | .version = XTABLES_VERSION, |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 136 | .size = XT_ALIGN(sizeof(struct xt_DSCP_info)), |
| 137 | .userspacesize = XT_ALIGN(sizeof(struct xt_DSCP_info)), |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 138 | .help = DSCP_help, |
| 139 | .parse = DSCP_parse, |
| 140 | .final_check = DSCP_check, |
| 141 | .print = DSCP_print, |
| 142 | .save = DSCP_save, |
| 143 | .extra_opts = DSCP_opts, |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 144 | }; |
| 145 | |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 146 | static struct xtables_target dscp_target6 = { |
Jan Engelhardt | 03d9948 | 2008-11-18 12:27:54 +0100 | [diff] [blame] | 147 | .family = NFPROTO_IPV6, |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 148 | .name = "DSCP", |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 149 | .version = XTABLES_VERSION, |
Yasuyuki KOZAKAI | a7bf6d0 | 2007-08-04 08:24:29 +0000 | [diff] [blame] | 150 | .size = XT_ALIGN(sizeof(struct xt_DSCP_info)), |
| 151 | .userspacesize = XT_ALIGN(sizeof(struct xt_DSCP_info)), |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 152 | .help = DSCP_help, |
| 153 | .parse = DSCP_parse, |
| 154 | .final_check = DSCP_check, |
| 155 | .print = DSCP_print, |
| 156 | .save = DSCP_save, |
| 157 | .extra_opts = DSCP_opts, |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 158 | }; |
| 159 | |
| 160 | void _init(void) |
| 161 | { |
Jan Engelhardt | 932e648 | 2007-10-04 16:27:30 +0000 | [diff] [blame] | 162 | xtables_register_target(&dscp_target); |
| 163 | xtables_register_target(&dscp_target6); |
Harald Welte | 2e7377d | 2002-02-17 19:54:42 +0000 | [diff] [blame] | 164 | } |