1 /* ebt_mark_m
2 *
3 * Authors:
4 * Bart De Schuymer <[email protected]>
5 *
6 * July, 2002
7 *
8 * Adapted by Arturo Borrero Gonzalez <[email protected]>
9 * to use libxtables for ebtables-compat in 2015.
10 */
11
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <getopt.h>
16 #include <xtables.h>
17 #include <linux/netfilter_bridge/ebt_mark_m.h>
18
19 #define MARK '1'
20
21 static const struct option brmark_m_opts[] = {
22 { .name = "mark", .has_arg = true, .val = MARK },
23 XT_GETOPT_TABLEEND,
24 };
25
brmark_m_print_help(void)26 static void brmark_m_print_help(void)
27 {
28 printf(
29 "mark option:\n"
30 "--mark [!] [value][/mask]: Match nfmask value (see man page)\n");
31 }
32
brmark_m_init(struct xt_entry_match * match)33 static void brmark_m_init(struct xt_entry_match *match)
34 {
35 struct ebt_mark_m_info *info = (struct ebt_mark_m_info *)match->data;
36
37 info->mark = 0;
38 info->mask = 0;
39 info->invert = 0;
40 info->bitmask = 0;
41 }
42
43 #define OPT_MARK 0x01
44 static int
brmark_m_parse(int c,char ** argv,int invert,unsigned int * flags,const void * entry,struct xt_entry_match ** match)45 brmark_m_parse(int c, char **argv, int invert, unsigned int *flags,
46 const void *entry, struct xt_entry_match **match)
47 {
48 struct ebt_mark_m_info *info = (struct ebt_mark_m_info *)
49 (*match)->data;
50 char *end;
51
52 switch (c) {
53 case MARK:
54 if (invert)
55 info->invert = 1;
56 info->mark = strtoul(optarg, &end, 0);
57 info->bitmask = EBT_MARK_AND;
58 if (*end == '/') {
59 if (end == optarg)
60 info->bitmask = EBT_MARK_OR;
61 info->mask = strtoul(end+1, &end, 0);
62 } else {
63 info->mask = 0xffffffff;
64 }
65 if (*end != '\0' || end == optarg)
66 xtables_error(PARAMETER_PROBLEM, "Bad mark value '%s'",
67 optarg);
68 break;
69 default:
70 return 0;
71 }
72
73 *flags |= info->bitmask;
74 return 1;
75 }
76
brmark_m_final_check(unsigned int flags)77 static void brmark_m_final_check(unsigned int flags)
78 {
79 if (!flags)
80 xtables_error(PARAMETER_PROBLEM,
81 "You must specify proper arguments");
82 }
83
brmark_m_print(const void * ip,const struct xt_entry_match * match,int numeric)84 static void brmark_m_print(const void *ip, const struct xt_entry_match *match,
85 int numeric)
86 {
87 struct ebt_mark_m_info *info = (struct ebt_mark_m_info *)match->data;
88
89 printf("--mark ");
90 if (info->invert)
91 printf("! ");
92 if (info->bitmask == EBT_MARK_OR)
93 printf("/0x%lx ", info->mask);
94 else if (info->mask != 0xffffffff)
95 printf("0x%lx/0x%lx ", info->mark, info->mask);
96 else
97 printf("0x%lx ", info->mark);
98 }
99
brmark_m_xlate(struct xt_xlate * xl,const struct xt_xlate_mt_params * params)100 static int brmark_m_xlate(struct xt_xlate *xl,
101 const struct xt_xlate_mt_params *params)
102 {
103 const struct ebt_mark_m_info *info = (const void*)params->match->data;
104 enum xt_op op = XT_OP_EQ;
105
106 if (info->invert)
107 op = XT_OP_NEQ;
108
109 xt_xlate_add(xl, "meta mark ");
110
111 if (info->bitmask == EBT_MARK_OR) {
112 xt_xlate_add(xl, "and 0x%x %s0 ", (uint32_t)info->mask,
113 info->invert ? "" : "!= ");
114 } else if (info->mask != 0xffffffffU) {
115 xt_xlate_add(xl, "and 0x%x %s0x%x ", (uint32_t)info->mask,
116 op == XT_OP_EQ ? "" : "!= ", (uint32_t)info->mark);
117 } else {
118 xt_xlate_add(xl, "%s0x%x ",
119 op == XT_OP_EQ ? "" : "!= ", (uint32_t)info->mark);
120 }
121
122 return 1;
123 }
124 static struct xtables_match brmark_m_match = {
125 .name = "mark_m",
126 .revision = 0,
127 .version = XTABLES_VERSION,
128 .family = NFPROTO_BRIDGE,
129 .size = XT_ALIGN(sizeof(struct ebt_mark_m_info)),
130 .userspacesize = XT_ALIGN(sizeof(struct ebt_mark_m_info)),
131 .init = brmark_m_init,
132 .help = brmark_m_print_help,
133 .parse = brmark_m_parse,
134 .final_check = brmark_m_final_check,
135 .print = brmark_m_print,
136 .xlate = brmark_m_xlate,
137 .extra_opts = brmark_m_opts,
138 };
139
_init(void)140 void _init(void)
141 {
142 xtables_register_match(&brmark_m_match);
143 }
144