1 /* Shared library add-on to ip6tables to add Hop-by-Hop and Dst headers support. */
9 #include <linux/netfilter_ipv6/ip6t_opts.h>
10 #include <sys/types.h>
11 #include <sys/socket.h>
12 #include <arpa/inet.h>
22 /* Function which prints out usage message. */
27 UNAME " v%s options:\n"
28 " --" LNAME "-len [!] length total length of this header\n"
29 " --" LNAME "-opts TYPE[:LEN][,TYPE[:LEN]...] \n"
30 " Options and its length (list, max: %d)\n",
31 IPTABLES_VERSION, IP6T_OPTS_OPTSNR);
34 static struct option opts[] = {
35 { .name = LNAME "-len", .has_arg = 1, .flag = 0, .val = '1' },
36 { .name = LNAME "-opts", .has_arg = 1, .flag = 0, .val = '2' },
37 { .name = LNAME "-not-strict", .has_arg = 1, .flag = 0, .val = '3' },
42 parse_opts_num(const char *idstr, const char *typestr)
47 id = strtoul(idstr, &ep, 0);
50 exit_error(PARAMETER_PROBLEM,
51 UNAME " no valid digits in %s `%s'", typestr, idstr);
53 if ( id == ULONG_MAX && errno == ERANGE ) {
54 exit_error(PARAMETER_PROBLEM,
55 "%s `%s' specified too big: would overflow",
58 if ( *idstr != '\0' && *ep != '\0' ) {
59 exit_error(PARAMETER_PROBLEM,
60 UNAME " error parsing %s `%s'", typestr, idstr);
62 return (u_int32_t) id;
66 parse_options(const char *optsstr, u_int16_t *opts)
68 char *buffer, *cp, *next, *range;
71 buffer = strdup(optsstr);
73 exit_error(OTHER_PROBLEM, "strdup failed");
75 for (cp = buffer, i = 0; cp && i < IP6T_OPTS_OPTSNR; cp = next, i++)
77 next = strchr(cp, ',');
82 range = strchr(cp, ':');
85 if (i == IP6T_OPTS_OPTSNR-1)
86 exit_error(PARAMETER_PROBLEM,
87 "too many ports specified");
91 opts[i] = (u_int16_t)((parse_opts_num(cp,"opt") & 0x000000FF)<<8);
94 exit_error(PARAMETER_PROBLEM,
95 "PAD0 hasn't got length");
96 opts[i] |= (u_int16_t)(parse_opts_num(range,"length") &
102 printf("opts str: %s %s\n", cp, range);
103 printf("opts opt: %04X\n", opts[i]);
108 exit_error(PARAMETER_PROBLEM, "too many addresses specified");
113 printf("addr nr: %d\n", i);
119 /* Initialize the match. */
121 init(struct ip6t_entry_match *m, unsigned int *nfcache)
123 struct ip6t_opts *optinfo = (struct ip6t_opts *)m->data;
127 optinfo->invflags = 0;
131 /* Function which parses command options; returns true if it
134 parse(int c, char **argv, int invert, unsigned int *flags,
135 const struct ip6t_entry *entry,
136 unsigned int *nfcache,
137 struct ip6t_entry_match **match)
139 struct ip6t_opts *optinfo = (struct ip6t_opts *)(*match)->data;
143 if (*flags & IP6T_OPTS_LEN)
144 exit_error(PARAMETER_PROBLEM,
145 "Only one `--" LNAME "-len' allowed");
146 check_inverse(optarg, &invert, &optind, 0);
147 optinfo->hdrlen = parse_opts_num(argv[optind-1], "length");
149 optinfo->invflags |= IP6T_OPTS_INV_LEN;
150 optinfo->flags |= IP6T_OPTS_LEN;
151 *flags |= IP6T_OPTS_LEN;
154 if (*flags & IP6T_OPTS_OPTS)
155 exit_error(PARAMETER_PROBLEM,
156 "Only one `--" LNAME "-opts' allowed");
157 check_inverse(optarg, &invert, &optind, 0);
159 exit_error(PARAMETER_PROBLEM,
160 " '!' not allowed with `--" LNAME "-opts'");
161 optinfo->optsnr = parse_options(argv[optind-1], optinfo->opts);
162 optinfo->flags |= IP6T_OPTS_OPTS;
163 *flags |= IP6T_OPTS_OPTS;
166 if (*flags & IP6T_OPTS_NSTRICT)
167 exit_error(PARAMETER_PROBLEM,
168 "Only one `--" LNAME "-not-strict' allowed");
169 if ( !(*flags & IP6T_OPTS_OPTS) )
170 exit_error(PARAMETER_PROBLEM,
171 "`--" LNAME "-opts ...' required before `--"
172 LNAME "-not-strict'");
173 optinfo->flags |= IP6T_OPTS_NSTRICT;
174 *flags |= IP6T_OPTS_NSTRICT;
183 /* Final check; we don't care. */
185 final_check(unsigned int flags)
190 print_options(int optsnr, u_int16_t *optsp)
194 for(i = 0; i < optsnr; i++) {
195 printf("%d", (optsp[i] & 0xFF00) >> 8);
197 if ((optsp[i] & 0x00FF) != 0x00FF)
198 printf(":%d", (optsp[i] & 0x00FF));
200 printf("%c", (i != optsnr - 1) ? ',' : ' ');
204 /* Prints out the union ip6t_matchinfo. */
206 print(const struct ip6t_ip6 *ip,
207 const struct ip6t_entry_match *match, int numeric)
209 const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data;
212 if (optinfo->flags & IP6T_OPTS_LEN)
213 printf("length:%s%u ",
214 optinfo->invflags & IP6T_OPTS_INV_LEN ? "!" : "",
217 if (optinfo->flags & IP6T_OPTS_OPTS)
220 print_options(optinfo->optsnr, (u_int16_t *)optinfo->opts);
222 if (optinfo->flags & IP6T_OPTS_NSTRICT)
223 printf("not-strict ");
225 if (optinfo->invflags & ~IP6T_OPTS_INV_MASK)
226 printf("Unknown invflags: 0x%X ",
227 optinfo->invflags & ~IP6T_OPTS_INV_MASK);
230 /* Saves the union ip6t_matchinfo in parsable form to stdout. */
231 static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
233 const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data;
235 if (optinfo->flags & IP6T_OPTS_LEN) {
236 printf("--" LNAME "-len %s%u ",
237 (optinfo->invflags & IP6T_OPTS_INV_LEN) ? "! " : "",
241 if (optinfo->flags & IP6T_OPTS_OPTS)
242 printf("--" LNAME "-opts ");
244 print_options(optinfo->optsnr, (u_int16_t *)optinfo->opts);
246 if (optinfo->flags & IP6T_OPTS_NSTRICT)
247 printf("--" LNAME "-not-strict ");
251 struct ip6tables_match optstruct = {
253 .version = IPTABLES_VERSION,
254 .size = IP6T_ALIGN(sizeof(struct ip6t_opts)),
255 .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_opts)),
259 .final_check = &final_check,
268 register_match6(&optstruct);