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 },
56 print_icmpv6types(void)
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. */
77 static void icmp6_help(void)
80 "icmpv6 match options:\n"
81 " --icmpv6-type [!] typename match icmpv6 type\n"
82 " (or numeric type or type/code)\n");
86 static const struct option icmp6_opts[] = {
87 { "icmpv6-type", 1, NULL, '1' },
92 parse_icmpv6(const char *icmpv6type, u_int8_t *type, u_int8_t code[])
94 unsigned int limit = sizeof(icmpv6_codes)/sizeof(struct icmpv6_names);
95 unsigned int match = limit;
98 for (i = 0; i < limit; i++) {
99 if (strncasecmp(icmpv6_codes[i].name, icmpv6type, strlen(icmpv6type))
102 exit_error(PARAMETER_PROBLEM,
103 "Ambiguous ICMPv6 type `%s':"
106 icmpv6_codes[match].name,
107 icmpv6_codes[i].name);
112 if (match != limit) {
113 *type = icmpv6_codes[match].type;
114 code[0] = icmpv6_codes[match].code_min;
115 code[1] = icmpv6_codes[match].code_max;
118 char buffer[strlen(icmpv6type) + 1];
121 strcpy(buffer, icmpv6type);
122 slash = strchr(buffer, '/');
127 if (string_to_number(buffer, 0, 255, &number) == -1)
128 exit_error(PARAMETER_PROBLEM,
129 "Invalid ICMPv6 type `%s'\n", buffer);
132 if (string_to_number(slash+1, 0, 255, &number) == -1)
133 exit_error(PARAMETER_PROBLEM,
134 "Invalid ICMPv6 code `%s'\n",
136 code[0] = code[1] = number;
144 /* Initialize the match. */
145 static void icmp6_init(struct xt_entry_match *m)
147 struct ip6t_icmp *icmpv6info = (struct ip6t_icmp *)m->data;
149 icmpv6info->code[1] = 0xFF;
152 /* Function which parses command options; returns true if it
154 static int icmp6_parse(int c, char **argv, int invert, unsigned int *flags,
155 const void *entry, struct xt_entry_match **match)
157 struct ip6t_icmp *icmpv6info = (struct ip6t_icmp *)(*match)->data;
162 exit_error(PARAMETER_PROBLEM,
163 "icmpv6 match: only use --icmpv6-type once!");
164 check_inverse(optarg, &invert, &optind, 0);
165 parse_icmpv6(argv[optind-1], &icmpv6info->type,
168 icmpv6info->invflags |= IP6T_ICMP_INV;
179 static void print_icmpv6type(u_int8_t type,
180 u_int8_t code_min, u_int8_t code_max,
188 i < sizeof(icmpv6_codes)/sizeof(struct icmpv6_names);
190 if (icmpv6_codes[i].type == type
191 && icmpv6_codes[i].code_min == code_min
192 && icmpv6_codes[i].code_max == code_max)
196 if (i != sizeof(icmpv6_codes)/sizeof(struct icmpv6_names)) {
199 icmpv6_codes[i].name);
207 printf("type %u", type);
208 if (code_min == 0 && code_max == 0xFF)
210 else if (code_min == code_max)
211 printf(" code %u ", code_min);
213 printf(" codes %u-%u ", code_min, code_max);
216 /* Prints out the union ipt_matchinfo. */
217 static void icmp6_print(const void *ip, const struct xt_entry_match *match,
220 const struct ip6t_icmp *icmpv6 = (struct ip6t_icmp *)match->data;
222 printf("ipv6-icmp ");
223 print_icmpv6type(icmpv6->type, icmpv6->code[0], icmpv6->code[1],
224 icmpv6->invflags & IP6T_ICMP_INV,
227 if (icmpv6->invflags & ~IP6T_ICMP_INV)
228 printf("Unknown invflags: 0x%X ",
229 icmpv6->invflags & ~IP6T_ICMP_INV);
232 /* Saves the match in parsable form to stdout. */
233 static void icmp6_save(const void *ip, const struct xt_entry_match *match)
235 const struct ip6t_icmp *icmpv6 = (struct ip6t_icmp *)match->data;
237 if (icmpv6->invflags & IP6T_ICMP_INV)
240 printf("--icmpv6-type %u", icmpv6->type);
241 if (icmpv6->code[0] != 0 || icmpv6->code[1] != 0xFF)
242 printf("/%u", icmpv6->code[0]);
246 static void icmp6_check(unsigned int flags)
249 exit_error(PARAMETER_PROBLEM,
250 "icmpv6 match: You must specify `--icmpv6-type'");
253 static struct xtables_match icmp6_mt6_reg = {
255 .version = XTABLES_VERSION,
257 .size = XT_ALIGN(sizeof(struct ip6t_icmp)),
258 .userspacesize = XT_ALIGN(sizeof(struct ip6t_icmp)),
261 .parse = icmp6_parse,
262 .final_check = icmp6_check,
263 .print = icmp6_print,
265 .extra_opts = icmp6_opts,
270 xtables_register_match(&icmp6_mt6_reg);