1 /* Shared library add-on to iptables for DSCP
3 * (C) 2000- 2002 by Matthew G. Marsh <mgm@paktronix.com>,
4 * Harald Welte <laforge@gnumonks.org>
6 * This program is distributed under the terms of GNU GPL v2, 1991
8 * libipt_DSCP.c borrowed heavily from libipt_TOS.c
10 * --set-class added by Iain Barnes
18 #include <linux/netfilter/x_tables.h>
19 #include <linux/netfilter/xt_DSCP.h>
21 /* This is evil, but it's my code - HW*/
22 #include "dscp_helper.c"
24 static void DSCP_help(void)
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"
31 " --set-dscp-class class Set the DSCP field in packet header to the\n"
32 " value represented by the DiffServ class value.\n"
33 " This class may be EF,BE or any of the CSxx\n"
36 " These two options are mutually exclusive !\n"
40 static const struct option DSCP_opts[] = {
41 { "set-dscp", 1, NULL, 'F' },
42 { "set-dscp-class", 1, NULL, 'G' },
47 parse_dscp(const char *s, struct xt_DSCP_info *dinfo)
51 if (string_to_number(s, 0, 255, &dscp) == -1)
52 exit_error(PARAMETER_PROBLEM,
53 "Invalid dscp `%s'\n", s);
55 if (dscp > XT_DSCP_MAX)
56 exit_error(PARAMETER_PROBLEM,
57 "DSCP `%d` out of range\n", dscp);
59 dinfo->dscp = (u_int8_t )dscp;
65 parse_class(const char *s, struct xt_DSCP_info *dinfo)
67 unsigned int dscp = class_to_dscp(s);
69 /* Assign the value */
70 dinfo->dscp = (u_int8_t)dscp;
74 static int DSCP_parse(int c, char **argv, int invert, unsigned int *flags,
75 const void *entry, struct xt_entry_target **target)
77 struct xt_DSCP_info *dinfo
78 = (struct xt_DSCP_info *)(*target)->data;
83 exit_error(PARAMETER_PROBLEM,
84 "DSCP target: Only use --set-dscp ONCE!");
85 parse_dscp(optarg, dinfo);
90 exit_error(PARAMETER_PROBLEM,
91 "DSCP target: Only use --set-dscp-class ONCE!");
92 parse_class(optarg, dinfo);
103 static void DSCP_check(unsigned int flags)
106 exit_error(PARAMETER_PROBLEM,
107 "DSCP target: Parameter --set-dscp is required");
111 print_dscp(u_int8_t dscp, int numeric)
113 printf("0x%02x ", dscp);
116 /* Prints out the targinfo. */
117 static void DSCP_print(const void *ip, const struct xt_entry_target *target,
120 const struct xt_DSCP_info *dinfo =
121 (const struct xt_DSCP_info *)target->data;
123 print_dscp(dinfo->dscp, numeric);
126 /* Saves the union ipt_targinfo in parsable form to stdout. */
127 static void DSCP_save(const void *ip, const struct xt_entry_target *target)
129 const struct xt_DSCP_info *dinfo =
130 (const struct xt_DSCP_info *)target->data;
132 printf("--set-dscp 0x%02x ", dinfo->dscp);
135 static struct xtables_target dscp_target = {
138 .version = XTABLES_VERSION,
139 .size = XT_ALIGN(sizeof(struct xt_DSCP_info)),
140 .userspacesize = XT_ALIGN(sizeof(struct xt_DSCP_info)),
143 .final_check = DSCP_check,
146 .extra_opts = DSCP_opts,
149 static struct xtables_target dscp_target6 = {
152 .version = XTABLES_VERSION,
153 .size = XT_ALIGN(sizeof(struct xt_DSCP_info)),
154 .userspacesize = XT_ALIGN(sizeof(struct xt_DSCP_info)),
157 .final_check = DSCP_check,
160 .extra_opts = DSCP_opts,
165 xtables_register_target(&dscp_target);
166 xtables_register_target(&dscp_target6);