1 #include <stdio.h>
2 #if defined(__GLIBC__) && __GLIBC__ == 2
3 #include <net/ethernet.h>
4 #else
5 #include <linux/if_ether.h>
6 #endif
7 #include <xtables.h>
8 #include <linux/netfilter/xt_mac.h>
9
10 enum {
11 O_MAC = 0,
12 };
13
mac_help(void)14 static void mac_help(void)
15 {
16 printf(
17 "mac match options:\n"
18 "[!] --mac-source XX:XX:XX:XX:XX:XX\n"
19 " Match source MAC address\n");
20 }
21
22 #define s struct xt_mac_info
23 static const struct xt_option_entry mac_opts[] = {
24 {.name = "mac-source", .id = O_MAC, .type = XTTYPE_ETHERMAC,
25 .flags = XTOPT_MAND | XTOPT_INVERT | XTOPT_PUT,
26 XTOPT_POINTER(s, srcaddr)},
27 XTOPT_TABLEEND,
28 };
29 #undef s
30
mac_parse(struct xt_option_call * cb)31 static void mac_parse(struct xt_option_call *cb)
32 {
33 struct xt_mac_info *macinfo = cb->data;
34
35 xtables_option_parse(cb);
36 if (cb->invert)
37 macinfo->invert = 1;
38 }
39
print_mac(const unsigned char * macaddress)40 static void print_mac(const unsigned char *macaddress)
41 {
42 unsigned int i;
43
44 printf(" %02X", macaddress[0]);
45 for (i = 1; i < ETH_ALEN; ++i)
46 printf(":%02X", macaddress[i]);
47 }
48
49 static void
mac_print(const void * ip,const struct xt_entry_match * match,int numeric)50 mac_print(const void *ip, const struct xt_entry_match *match, int numeric)
51 {
52 const struct xt_mac_info *info = (void *)match->data;
53
54 printf(" MAC");
55
56 if (info->invert)
57 printf(" !");
58
59 print_mac(info->srcaddr);
60 }
61
mac_save(const void * ip,const struct xt_entry_match * match)62 static void mac_save(const void *ip, const struct xt_entry_match *match)
63 {
64 const struct xt_mac_info *info = (void *)match->data;
65
66 if (info->invert)
67 printf(" !");
68
69 printf(" --mac-source");
70 print_mac(info->srcaddr);
71 }
72
print_mac_xlate(const unsigned char * macaddress,struct xt_xlate * xl)73 static void print_mac_xlate(const unsigned char *macaddress,
74 struct xt_xlate *xl)
75 {
76 unsigned int i;
77
78 xt_xlate_add(xl, "%02x", macaddress[0]);
79 for (i = 1; i < ETH_ALEN; ++i)
80 xt_xlate_add(xl, ":%02x", macaddress[i]);
81 }
82
mac_xlate(struct xt_xlate * xl,const struct xt_xlate_mt_params * params)83 static int mac_xlate(struct xt_xlate *xl,
84 const struct xt_xlate_mt_params *params)
85 {
86 const struct xt_mac_info *info = (void *)params->match->data;
87
88 xt_xlate_add(xl, "ether saddr%s ", info->invert ? " !=" : "");
89 print_mac_xlate(info->srcaddr, xl);
90
91 return 1;
92 }
93
94 static struct xtables_match mac_match = {
95 .family = NFPROTO_UNSPEC,
96 .name = "mac",
97 .version = XTABLES_VERSION,
98 .size = XT_ALIGN(sizeof(struct xt_mac_info)),
99 .userspacesize = XT_ALIGN(sizeof(struct xt_mac_info)),
100 .help = mac_help,
101 .x6_parse = mac_parse,
102 .print = mac_print,
103 .save = mac_save,
104 .x6_options = mac_opts,
105 .xlate = mac_xlate,
106 };
107
_init(void)108 void _init(void)
109 {
110 xtables_register_match(&mac_match);
111 }
112