1 /* Shared library add-on to iptables for DSCP
3 * (C) 2002 by Harald Welte <laforge@gnumonks.org>
5 * This program is distributed under the terms of GNU GPL v2, 1991
7 * libipt_dscp.c borrowed heavily from libipt_tos.c
9 * --class support added by Iain Barnes
11 * For a list of DSCP codepoints see
12 * http://www.iana.org/assignments/dscp-registry
21 #include <linux/netfilter/x_tables.h>
22 #include <linux/netfilter/xt_dscp.h>
24 /* This is evil, but it's my code - HW*/
25 #include "dscp_helper.c"
27 static void dscp_help(void)
30 "dscp match options\n"
31 "[!] --dscp value Match DSCP codepoint with numerical value\n"
32 " This value can be in decimal (ex: 32)\n"
33 " or in hex (ex: 0x20)\n"
34 "[!] --dscp-class name Match the DiffServ class. This value may\n"
35 " be any of the BE,EF, AFxx or CSx classes\n"
37 " These two options are mutually exclusive !\n");
40 static const struct option dscp_opts[] = {
41 { "dscp", 1, NULL, 'F' },
42 { "dscp-class", 1, NULL, 'G' },
47 parse_dscp(const char *s, struct xt_dscp_info *dinfo)
51 if (!xtables_strtoui(s, NULL, &dscp, 0, UINT8_MAX))
52 xtables_error(PARAMETER_PROBLEM,
53 "Invalid dscp `%s'\n", s);
55 if (dscp > XT_DSCP_MAX)
56 xtables_error(PARAMETER_PROBLEM,
57 "DSCP `%d` out of range\n", dscp);
64 parse_class(const char *s, struct xt_dscp_info *dinfo)
66 unsigned int dscp = class_to_dscp(s);
68 /* Assign the value */
74 dscp_parse(int c, char **argv, int invert, unsigned int *flags,
75 const void *entry, struct xt_entry_match **match)
77 struct xt_dscp_info *dinfo
78 = (struct xt_dscp_info *)(*match)->data;
83 xtables_error(PARAMETER_PROBLEM,
84 "DSCP match: Only use --dscp ONCE!");
85 xtables_check_inverse(optarg, &invert, &optind, 0, argv);
86 parse_dscp(optarg, dinfo);
94 xtables_error(PARAMETER_PROBLEM,
95 "DSCP match: Only use --dscp-class ONCE!");
96 xtables_check_inverse(optarg, &invert, &optind, 0, argv);
97 parse_class(optarg, dinfo);
110 static void dscp_check(unsigned int flags)
113 xtables_error(PARAMETER_PROBLEM,
114 "DSCP match: Parameter --dscp is required");
118 dscp_print(const void *ip, const struct xt_entry_match *match, int numeric)
120 const struct xt_dscp_info *dinfo =
121 (const struct xt_dscp_info *)match->data;
122 printf("DSCP match %s0x%02x", dinfo->invert ? "!" : "", dinfo->dscp);
125 static void dscp_save(const void *ip, const struct xt_entry_match *match)
127 const struct xt_dscp_info *dinfo =
128 (const struct xt_dscp_info *)match->data;
130 printf("%s--dscp 0x%02x ", dinfo->invert ? "! " : "", dinfo->dscp);
133 static struct xtables_match dscp_match = {
134 .family = NFPROTO_UNSPEC,
136 .version = XTABLES_VERSION,
137 .size = XT_ALIGN(sizeof(struct xt_dscp_info)),
138 .userspacesize = XT_ALIGN(sizeof(struct xt_dscp_info)),
141 .final_check = dscp_check,
144 .extra_opts = dscp_opts,
149 xtables_register_match(&dscp_match);