1 /* Shared library add-on to iptables to add multiple TCP port support. */
8 /* To ensure that iptables compiles with an old kernel */
9 #include "../include/linux/netfilter_ipv6/ip6t_multiport.h"
11 /* Function which prints out usage message. */
16 "multiport v%s options:\n"
17 " --source-ports port[,port,port...]\n"
19 " match source port(s)\n"
20 " --destination-ports port[,port,port...]\n"
22 " match destination port(s)\n"
23 " --ports port[,port,port]\n"
24 " match both source and destination port(s)\n"
25 " NOTE: this kernel does not support port ranges in multiport.\n",
33 "multiport v%s options:\n"
34 " --source-ports [!] port[,port:port,port...]\n"
36 " match source port(s)\n"
37 " --destination-ports [!] port[,port:port,port...]\n"
39 " match destination port(s)\n"
40 " --ports [!] port[,port:port,port]\n"
41 " match both source and destination port(s)\n",
45 static struct option opts[] = {
46 { "source-ports", 1, 0, '1' },
47 { "sports", 1, 0, '1' }, /* synonym */
48 { "destination-ports", 1, 0, '2' },
49 { "dports", 1, 0, '2' }, /* synonym */
50 { "ports", 1, 0, '3' },
55 proto_to_name(u_int8_t proto)
72 parse_multi_ports(const char *portstring, u_int16_t *ports, const char *proto)
74 char *buffer, *cp, *next;
77 buffer = strdup(portstring);
78 if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed");
80 for (cp=buffer, i=0; cp && i<IP6T_MULTI_PORTS; cp=next,i++)
83 if (next) *next++='\0';
84 ports[i] = parse_port(cp, proto);
86 if (cp) exit_error(PARAMETER_PROBLEM, "too many ports specified");
92 parse_multi_ports_v1(const char *portstring,
93 struct ip6t_multiport_v1 *multiinfo,
96 char *buffer, *cp, *next, *range;
100 buffer = strdup(portstring);
101 if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed");
103 for (i=0; i<IP6T_MULTI_PORTS; i++)
104 multiinfo->pflags[i] = 0;
106 for (cp=buffer, i=0; cp && i<IP6T_MULTI_PORTS; cp=next, i++) {
107 next=strchr(cp, ',');
108 if (next) *next++='\0';
109 range = strchr(cp, ':');
111 if (i == IP6T_MULTI_PORTS-1)
112 exit_error(PARAMETER_PROBLEM,
113 "too many ports specified");
116 multiinfo->ports[i] = parse_port(cp, proto);
118 multiinfo->pflags[i] = 1;
119 multiinfo->ports[++i] = parse_port(range, proto);
120 if (multiinfo->ports[i-1] >= multiinfo->ports[i])
121 exit_error(PARAMETER_PROBLEM,
122 "invalid portrange specified");
126 multiinfo->count = i;
127 if (cp) exit_error(PARAMETER_PROBLEM, "too many ports specified");
131 /* Initialize the match. */
133 init(struct ip6t_entry_match *m, unsigned int *nfcache)
138 check_proto(const struct ip6t_entry *entry)
142 if ((proto = proto_to_name(entry->ipv6.proto)) != NULL)
144 else if (!entry->ipv6.proto)
145 exit_error(PARAMETER_PROBLEM,
146 "multiport needs `-p tcp', `-p udp', `-p sctp' or `-p dccp'");
148 exit_error(PARAMETER_PROBLEM,
149 "multiport only works with TCP, UDP, SCTP and DCCP");
152 /* Function which parses command options; returns true if it
155 parse(int c, char **argv, int invert, unsigned int *flags,
156 const struct ip6t_entry *entry,
157 unsigned int *nfcache,
158 struct ip6t_entry_match **match)
161 struct ip6t_multiport *multiinfo
162 = (struct ip6t_multiport *)(*match)->data;
166 check_inverse(argv[optind-1], &invert, &optind, 0);
167 proto = check_proto(entry);
168 multiinfo->count = parse_multi_ports(argv[optind-1],
169 multiinfo->ports, proto);
170 multiinfo->flags = IP6T_MULTIPORT_SOURCE;
174 check_inverse(argv[optind-1], &invert, &optind, 0);
175 proto = check_proto(entry);
176 multiinfo->count = parse_multi_ports(argv[optind-1],
177 multiinfo->ports, proto);
178 multiinfo->flags = IP6T_MULTIPORT_DESTINATION;
182 check_inverse(argv[optind-1], &invert, &optind, 0);
183 proto = check_proto(entry);
184 multiinfo->count = parse_multi_ports(argv[optind-1],
185 multiinfo->ports, proto);
186 multiinfo->flags = IP6T_MULTIPORT_EITHER;
194 exit_error(PARAMETER_PROBLEM,
195 "multiport does not support invert");
198 exit_error(PARAMETER_PROBLEM,
199 "multiport can only have one option");
205 parse_v1(int c, char **argv, int invert, unsigned int *flags,
206 const struct ip6t_entry *entry,
207 unsigned int *nfcache,
208 struct ip6t_entry_match **match)
211 struct ip6t_multiport_v1 *multiinfo
212 = (struct ip6t_multiport_v1 *)(*match)->data;
216 check_inverse(argv[optind-1], &invert, &optind, 0);
217 proto = check_proto(entry);
218 parse_multi_ports_v1(argv[optind-1], multiinfo, proto);
219 multiinfo->flags = IP6T_MULTIPORT_SOURCE;
223 check_inverse(argv[optind-1], &invert, &optind, 0);
224 proto = check_proto(entry);
225 parse_multi_ports_v1(argv[optind-1], multiinfo, proto);
226 multiinfo->flags = IP6T_MULTIPORT_DESTINATION;
230 check_inverse(argv[optind-1], &invert, &optind, 0);
231 proto = check_proto(entry);
232 parse_multi_ports_v1(argv[optind-1], multiinfo, proto);
233 multiinfo->flags = IP6T_MULTIPORT_EITHER;
241 multiinfo->invert = 1;
244 exit_error(PARAMETER_PROBLEM,
245 "multiport can only have one option");
250 /* Final check; must specify something. */
252 final_check(unsigned int flags)
255 exit_error(PARAMETER_PROBLEM, "multiport expection an option");
259 port_to_service(int port, u_int8_t proto)
261 struct servent *service;
263 if ((service = getservbyport(htons(port), proto_to_name(proto))))
264 return service->s_name;
270 print_port(u_int16_t port, u_int8_t protocol, int numeric)
274 if (numeric || (service = port_to_service(port, protocol)) == NULL)
277 printf("%s", service);
280 /* Prints out the matchinfo. */
282 print(const struct ip6t_ip6 *ip,
283 const struct ip6t_entry_match *match,
286 const struct ip6t_multiport *multiinfo
287 = (const struct ip6t_multiport *)match->data;
290 printf("multiport ");
292 switch (multiinfo->flags) {
293 case IP6T_MULTIPORT_SOURCE:
297 case IP6T_MULTIPORT_DESTINATION:
301 case IP6T_MULTIPORT_EITHER:
310 for (i=0; i < multiinfo->count; i++) {
311 printf("%s", i ? "," : "");
312 print_port(multiinfo->ports[i], ip->proto, numeric);
318 print_v1(const struct ip6t_ip6 *ip,
319 const struct ip6t_entry_match *match,
322 const struct ip6t_multiport_v1 *multiinfo
323 = (const struct ip6t_multiport_v1 *)match->data;
326 printf("multiport ");
328 switch (multiinfo->flags) {
329 case IP6T_MULTIPORT_SOURCE:
333 case IP6T_MULTIPORT_DESTINATION:
337 case IP6T_MULTIPORT_EITHER:
346 if (multiinfo->invert)
349 for (i=0; i < multiinfo->count; i++) {
350 printf("%s", i ? "," : "");
351 print_port(multiinfo->ports[i], ip->proto, numeric);
352 if (multiinfo->pflags[i]) {
354 print_port(multiinfo->ports[++i], ip->proto, numeric);
360 /* Saves the union ip6t_matchinfo in parsable form to stdout. */
361 static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
363 const struct ip6t_multiport *multiinfo
364 = (const struct ip6t_multiport *)match->data;
367 switch (multiinfo->flags) {
368 case IP6T_MULTIPORT_SOURCE:
372 case IP6T_MULTIPORT_DESTINATION:
376 case IP6T_MULTIPORT_EITHER:
381 for (i=0; i < multiinfo->count; i++) {
382 printf("%s", i ? "," : "");
383 print_port(multiinfo->ports[i], ip->proto, 1);
388 static void save_v1(const struct ip6t_ip6 *ip,
389 const struct ip6t_entry_match *match)
391 const struct ip6t_multiport_v1 *multiinfo
392 = (const struct ip6t_multiport_v1 *)match->data;
395 switch (multiinfo->flags) {
396 case IP6T_MULTIPORT_SOURCE:
400 case IP6T_MULTIPORT_DESTINATION:
404 case IP6T_MULTIPORT_EITHER:
409 if (multiinfo->invert)
412 for (i=0; i < multiinfo->count; i++) {
413 printf("%s", i ? "," : "");
414 print_port(multiinfo->ports[i], ip->proto, 1);
415 if (multiinfo->pflags[i]) {
417 print_port(multiinfo->ports[++i], ip->proto, 1);
423 static struct ip6tables_match multiport = {
425 .version = IPTABLES_VERSION,
426 .size = IP6T_ALIGN(sizeof(struct ip6t_multiport)),
427 .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_multiport)),
431 .final_check = &final_check,
437 static struct ip6tables_match multiport_v1 = {
441 .version = IPTABLES_VERSION,
442 .size = IP6T_ALIGN(sizeof(struct ip6t_multiport_v1)),
443 .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_multiport_v1)),
447 .final_check = &final_check,
456 register_match6(&multiport);
457 register_match6(&multiport_v1);