1 /* Shared library add-on to iptables to add ICMP support. */
8 #include <linux/netfilter_ipv6/ip6_tables.h>
13 u_int8_t code_min
, code_max
;
16 static const struct icmpv6_names icmpv6_codes
[] = {
17 { "destination-unreachable", 1, 0, 0xFF },
18 { "no-route", 1, 0, 0 },
19 { "communication-prohibited", 1, 1, 1 },
20 { "address-unreachable", 1, 3, 3 },
21 { "port-unreachable", 1, 4, 4 },
23 { "packet-too-big", 2, 0, 0xFF },
25 { "time-exceeded", 3, 0, 0xFF },
26 /* Alias */ { "ttl-exceeded", 3, 0, 0xFF },
27 { "ttl-zero-during-transit", 3, 0, 0 },
28 { "ttl-zero-during-reassembly", 3, 1, 1 },
30 { "parameter-problem", 4, 0, 0xFF },
31 { "bad-header", 4, 0, 0 },
32 { "unknown-header-type", 4, 1, 1 },
33 { "unknown-option", 4, 2, 2 },
35 { "echo-request", 128, 0, 0xFF },
36 /* Alias */ { "ping", 128, 0, 0xFF },
38 { "echo-reply", 129, 0, 0xFF },
39 /* Alias */ { "pong", 129, 0, 0xFF },
41 { "router-solicitation", 133, 0, 0xFF },
43 { "router-advertisement", 134, 0, 0xFF },
45 { "neighbour-solicitation", 135, 0, 0xFF },
46 /* Alias */ { "neighbor-solicitation", 135, 0, 0xFF },
48 { "neighbour-advertisement", 136, 0, 0xFF },
49 /* Alias */ { "neighbor-advertisement", 136, 0, 0xFF },
51 { "redirect", 137, 0, 0xFF },
59 printf("Valid ICMPv6 Types:");
61 for (i
= 0; i
< sizeof(icmpv6_codes
)/sizeof(struct icmpv6_names
); i
++) {
62 if (i
&& icmpv6_codes
[i
].type
== icmpv6_codes
[i
-1].type
) {
63 if (icmpv6_codes
[i
].code_min
== icmpv6_codes
[i
-1].code_min
64 && (icmpv6_codes
[i
].code_max
65 == icmpv6_codes
[i
-1].code_max
))
66 printf(" (%s)", icmpv6_codes
[i
].name
);
68 printf("\n %s", icmpv6_codes
[i
].name
);
71 printf("\n%s", icmpv6_codes
[i
].name
);
76 /* Function which prints out usage message. */
81 "ICMPv6 v%s options:\n"
82 " --icmpv6-type [!] typename match icmpv6 type\n"
83 " (or numeric type or type/code)\n"
84 "\n", IPTABLES_VERSION
);
88 static struct option opts
[] = {
89 { "icmpv6-type", 1, 0, '1' },
94 parse_icmpv6(const char *icmpv6type
, u_int8_t
*type
, u_int8_t code
[])
96 unsigned int limit
= sizeof(icmpv6_codes
)/sizeof(struct icmpv6_names
);
97 unsigned int match
= limit
;
100 for (i
= 0; i
< limit
; i
++) {
101 if (strncasecmp(icmpv6_codes
[i
].name
, icmpv6type
, strlen(icmpv6type
))
104 exit_error(PARAMETER_PROBLEM
,
105 "Ambiguous ICMPv6 type `%s':"
108 icmpv6_codes
[match
].name
,
109 icmpv6_codes
[i
].name
);
114 if (match
!= limit
) {
115 *type
= icmpv6_codes
[match
].type
;
116 code
[0] = icmpv6_codes
[match
].code_min
;
117 code
[1] = icmpv6_codes
[match
].code_max
;
120 char buffer
[strlen(icmpv6type
) + 1];
123 strcpy(buffer
, icmpv6type
);
124 slash
= strchr(buffer
, '/');
129 if (string_to_number(buffer
, 0, 255, &number
) == -1)
130 exit_error(PARAMETER_PROBLEM
,
131 "Invalid ICMPv6 type `%s'\n", buffer
);
134 if (string_to_number(slash
+1, 0, 255, &number
) == -1)
135 exit_error(PARAMETER_PROBLEM
,
136 "Invalid ICMPv6 code `%s'\n",
138 code
[0] = code
[1] = number
;
146 /* Initialize the match. */
148 init(struct ip6t_entry_match
*m
, unsigned int *nfcache
)
150 struct ip6t_icmp
*icmpv6info
= (struct ip6t_icmp
*)m
->data
;
152 icmpv6info
->code
[1] = 0xFF;
155 /* Function which parses command options; returns true if it
158 parse(int c
, char **argv
, int invert
, unsigned int *flags
,
159 const struct ip6t_entry
*entry
,
160 unsigned int *nfcache
,
161 struct ip6t_entry_match
**match
)
163 struct ip6t_icmp
*icmpv6info
= (struct ip6t_icmp
*)(*match
)->data
;
168 exit_error(PARAMETER_PROBLEM
,
169 "icmpv6 match: only use --icmpv6-type once!");
170 check_inverse(optarg
, &invert
, &optind
, 0);
171 parse_icmpv6(argv
[optind
-1], &icmpv6info
->type
,
174 icmpv6info
->invflags
|= IP6T_ICMP_INV
;
185 static void print_icmpv6type(u_int8_t type
,
186 u_int8_t code_min
, u_int8_t code_max
,
194 i
< sizeof(icmpv6_codes
)/sizeof(struct icmpv6_names
);
196 if (icmpv6_codes
[i
].type
== type
197 && icmpv6_codes
[i
].code_min
== code_min
198 && icmpv6_codes
[i
].code_max
== code_max
)
202 if (i
!= sizeof(icmpv6_codes
)/sizeof(struct icmpv6_names
)) {
205 icmpv6_codes
[i
].name
);
213 printf("type %u", type
);
214 if (code_min
== 0 && code_max
== 0xFF)
216 else if (code_min
== code_max
)
217 printf(" code %u ", code_min
);
219 printf(" codes %u-%u ", code_min
, code_max
);
222 /* Prints out the union ipt_matchinfo. */
224 print(const struct ip6t_ip6
*ip
,
225 const struct ip6t_entry_match
*match
,
228 const struct ip6t_icmp
*icmpv6
= (struct ip6t_icmp
*)match
->data
;
230 printf("ipv6-icmp ");
231 print_icmpv6type(icmpv6
->type
, icmpv6
->code
[0], icmpv6
->code
[1],
232 icmpv6
->invflags
& IP6T_ICMP_INV
,
235 if (icmpv6
->invflags
& ~IP6T_ICMP_INV
)
236 printf("Unknown invflags: 0x%X ",
237 icmpv6
->invflags
& ~IP6T_ICMP_INV
);
240 /* Saves the match in parsable form to stdout. */
241 static void save(const struct ip6t_ip6
*ip
, const struct ip6t_entry_match
*match
)
243 const struct ip6t_icmp
*icmpv6
= (struct ip6t_icmp
*)match
->data
;
245 if (icmpv6
->invflags
& IP6T_ICMP_INV
)
248 printf("--icmpv6-type %u", icmpv6
->type
);
249 if (icmpv6
->code
[0] != 0 || icmpv6
->code
[1] != 0xFF)
250 printf("/%u", icmpv6
->code
[0]);
254 static void final_check(unsigned int flags
)
257 exit_error(PARAMETER_PROBLEM
,
258 "icmpv6 match: You must specify `--icmpv6-type'");
261 static struct ip6tables_match icmpv6
= {
263 .version
= IPTABLES_VERSION
,
264 .size
= IP6T_ALIGN(sizeof(struct ip6t_icmp
)),
265 .userspacesize
= IP6T_ALIGN(sizeof(struct ip6t_icmp
)),
269 .final_check
= &final_check
,
277 register_match6(&icmpv6
);