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_ipv4/ip_tables.h>
22 #include <linux/netfilter_ipv4/ipt_dscp.h>
24 /* This is evil, but it's my code - HW*/
25 #include "libipt_dscp_helper.c"
27 static void help(void)
30 "DSCP match v%s 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"
42 static struct option opts[] = {
43 { "dscp", 1, 0, 'F' },
44 { "dscp-class", 1, 0, 'G' },
49 parse_dscp(const char *s, struct ipt_dscp_info *dinfo)
53 if (string_to_number(s, 0, 255, &dscp) == -1)
54 exit_error(PARAMETER_PROBLEM,
55 "Invalid dscp `%s'\n", s);
57 if (dscp > IPT_DSCP_MAX)
58 exit_error(PARAMETER_PROBLEM,
59 "DSCP `%d` out of range\n", dscp);
61 dinfo->dscp = (u_int8_t )dscp;
67 parse_class(const char *s, struct ipt_dscp_info *dinfo)
69 unsigned int dscp = class_to_dscp(s);
71 /* Assign the value */
72 dinfo->dscp = (u_int8_t)dscp;
77 parse(int c, char **argv, int invert, unsigned int *flags,
78 const struct ipt_entry *entry,
79 unsigned int *nfcache,
80 struct ipt_entry_match **match)
82 struct ipt_dscp_info *dinfo
83 = (struct ipt_dscp_info *)(*match)->data;
88 exit_error(PARAMETER_PROBLEM,
89 "DSCP match: Only use --dscp ONCE!");
90 check_inverse(optarg, &invert, &optind, 0);
91 parse_dscp(argv[optind-1], dinfo);
99 exit_error(PARAMETER_PROBLEM,
100 "DSCP match: Only use --dscp-class ONCE!");
101 check_inverse(optarg, &invert, &optind, 0);
102 parse_class(argv[optind - 1], dinfo);
116 final_check(unsigned int flags)
119 exit_error(PARAMETER_PROBLEM,
120 "DSCP match: Parameter --dscp is required");
124 print_dscp(u_int8_t dscp, int invert, int numeric)
129 printf("0x%02x ", dscp);
132 /* Prints out the matchinfo. */
134 print(const struct ipt_ip *ip,
135 const struct ipt_entry_match *match,
138 const struct ipt_dscp_info *dinfo =
139 (const struct ipt_dscp_info *)match->data;
140 printf("DSCP match ");
141 print_dscp(dinfo->dscp, dinfo->invert, numeric);
144 /* Saves the union ipt_matchinfo in parsable form to stdout. */
146 save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
148 const struct ipt_dscp_info *dinfo =
149 (const struct ipt_dscp_info *)match->data;
152 print_dscp(dinfo->dscp, dinfo->invert, 1);
155 static struct iptables_match dscp = {
158 .version = IPTABLES_VERSION,
159 .size = IPT_ALIGN(sizeof(struct ipt_dscp_info)),
160 .userspacesize = IPT_ALIGN(sizeof(struct ipt_dscp_info)),
163 .final_check = &final_check,
171 register_match(&dscp);