1 /*
2 * Shared library add-on to iptables to add CONNSECMARK target support.
3 *
4 * Based on the MARK and CONNMARK targets.
5 *
6 * Copyright (C) 2006 Red Hat, Inc., James Morris <jmorris@redhat.com>
7 */
8 #include <stdio.h>
9 #include <string.h>
10 #include <stdlib.h>
11 #include <getopt.h>
12 #include <iptables.h>
13 #include <linux/netfilter/xt_CONNSECMARK.h>
14
15 #define PFX "CONNSECMARK target: "
16
help(void)17 static void help(void)
18 {
19 printf(
20 "CONNSECMARK target v%s options:\n"
21 " --save Copy security mark from packet to conntrack\n"
22 " --restore Copy security mark from connection to packet\n"
23 "\n",
24 IPTABLES_VERSION);
25 }
26
27 static struct option opts[] = {
28 { "save", 0, 0, '1' },
29 { "restore", 0, 0, '2' },
30 { 0 }
31 };
32
parse(int c,char ** argv,int invert,unsigned int * flags,const struct ipt_entry * entry,struct ipt_entry_target ** target)33 static int parse(int c, char **argv, int invert, unsigned int *flags,
34 const struct ipt_entry *entry, struct ipt_entry_target **target)
35 {
36 struct xt_connsecmark_target_info *info =
37 (struct xt_connsecmark_target_info*)(*target)->data;
38
39 switch (c) {
40 case '1':
41 if (*flags & CONNSECMARK_SAVE)
42 exit_error(PARAMETER_PROBLEM, PFX
43 "Can't specify --save twice");
44 info->mode = CONNSECMARK_SAVE;
45 *flags |= CONNSECMARK_SAVE;
46 break;
47
48 case '2':
49 if (*flags & CONNSECMARK_RESTORE)
50 exit_error(PARAMETER_PROBLEM, PFX
51 "Can't specify --restore twice");
52 info->mode = CONNSECMARK_RESTORE;
53 *flags |= CONNSECMARK_RESTORE;
54 break;
55
56 default:
57 return 0;
58 }
59
60 return 1;
61 }
62
final_check(unsigned int flags)63 static void final_check(unsigned int flags)
64 {
65 if (!flags)
66 exit_error(PARAMETER_PROBLEM, PFX "parameter required");
67
68 if (flags == (CONNSECMARK_SAVE|CONNSECMARK_RESTORE))
69 exit_error(PARAMETER_PROBLEM, PFX "only one flag of --save "
70 "or --restore is allowed");
71 }
72
print_connsecmark(struct xt_connsecmark_target_info * info)73 static void print_connsecmark(struct xt_connsecmark_target_info *info)
74 {
75 switch (info->mode) {
76 case CONNSECMARK_SAVE:
77 printf("save ");
78 break;
79
80 case CONNSECMARK_RESTORE:
81 printf("restore ");
82 break;
83
84 default:
85 exit_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
86 }
87 }
88
print(const struct ipt_ip * ip,const struct ipt_entry_target * target,int numeric)89 static void print(const struct ipt_ip *ip,
90 const struct ipt_entry_target *target, int numeric)
91 {
92 struct xt_connsecmark_target_info *info =
93 (struct xt_connsecmark_target_info*)(target)->data;
94
95 printf("CONNSECMARK ");
96 print_connsecmark(info);
97 }
98
save(const struct ipt_ip * ip,const struct ipt_entry_target * target)99 static void save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
100 {
101 struct xt_connsecmark_target_info *info =
102 (struct xt_connsecmark_target_info*)target->data;
103
104 printf("--");
105 print_connsecmark(info);
106 }
107
108 static struct iptables_target connsecmark = {
109 .next = NULL,
110 .name = "CONNSECMARK",
111 .version = IPTABLES_VERSION,
112 .revision = 0,
113 .size = IPT_ALIGN(sizeof(struct xt_connsecmark_target_info)),
114 .userspacesize = IPT_ALIGN(sizeof(struct xt_connsecmark_target_info)),
115 .parse = &parse,
116 .help = &help,
117 .final_check = &final_check,
118 .print = &print,
119 .save = &save,
120 .extra_opts = opts
121 };
122
ipt_CONNSECMARK_init(void)123 void ipt_CONNSECMARK_init(void)
124 {
125 register_target(&connsecmark);
126 }
127