1 /* Shared library add-on to ip6tables to add AH support. */
9 #include <linux/netfilter_ipv6/ip6t_ah.h>
11 /* Function which prints out usage message. */
17 " --ahspi [!] spi[:spi] match spi (range)\n"
18 " --ahlen [!] length total length of this header\n"
19 " --ahres check the reserved filed, too\n",
23 static struct option opts[] = {
24 { .name = "ahspi", .has_arg = 1, .flag = 0, .val = '1' },
25 { .name = "ahlen", .has_arg = 1, .flag = 0, .val = '2' },
26 { .name = "ahres", .has_arg = 0, .flag = 0, .val = '3' },
31 parse_ah_spi(const char *spistr, const char *typestr)
33 unsigned long int spi;
36 spi = strtoul(spistr, &ep, 0);
39 exit_error(PARAMETER_PROBLEM,
40 "AH no valid digits in %s `%s'", typestr, spistr);
42 if ( spi == ULONG_MAX && errno == ERANGE )
43 exit_error(PARAMETER_PROBLEM,
44 "%s `%s' specified too big: would overflow",
47 if ( *spistr != '\0' && *ep != '\0' )
48 exit_error(PARAMETER_PROBLEM,
49 "AH error parsing %s `%s'", typestr, spistr);
51 return (u_int32_t) spi;
55 parse_ah_spis(const char *spistring, u_int32_t *spis)
60 buffer = strdup(spistring);
61 if ((cp = strchr(buffer, ':')) == NULL)
62 spis[0] = spis[1] = parse_ah_spi(buffer, "spi");
67 spis[0] = buffer[0] ? parse_ah_spi(buffer, "spi") : 0;
68 spis[1] = cp[0] ? parse_ah_spi(cp, "spi") : 0xFFFFFFFF;
73 /* Initialize the match. */
75 init(struct ip6t_entry_match *m, unsigned int *nfcache)
77 struct ip6t_ah *ahinfo = (struct ip6t_ah *)m->data;
79 ahinfo->spis[1] = 0xFFFFFFFF;
84 /* Function which parses command options; returns true if it
87 parse(int c, char **argv, int invert, unsigned int *flags,
88 const struct ip6t_entry *entry,
89 unsigned int *nfcache,
90 struct ip6t_entry_match **match)
92 struct ip6t_ah *ahinfo = (struct ip6t_ah *)(*match)->data;
96 if (*flags & IP6T_AH_SPI)
97 exit_error(PARAMETER_PROBLEM,
98 "Only one `--ahspi' allowed");
99 check_inverse(optarg, &invert, &optind, 0);
100 parse_ah_spis(argv[optind-1], ahinfo->spis);
102 ahinfo->invflags |= IP6T_AH_INV_SPI;
103 *flags |= IP6T_AH_SPI;
106 if (*flags & IP6T_AH_LEN)
107 exit_error(PARAMETER_PROBLEM,
108 "Only one `--ahlen' allowed");
109 check_inverse(optarg, &invert, &optind, 0);
110 ahinfo->hdrlen = parse_ah_spi(argv[optind-1], "length");
112 ahinfo->invflags |= IP6T_AH_INV_LEN;
113 *flags |= IP6T_AH_LEN;
116 if (*flags & IP6T_AH_RES)
117 exit_error(PARAMETER_PROBLEM,
118 "Only one `--ahres' allowed");
120 *flags |= IP6T_AH_RES;
129 /* Final check; we don't care. */
131 final_check(unsigned int flags)
136 print_spis(const char *name, u_int32_t min, u_int32_t max,
139 const char *inv = invert ? "!" : "";
141 if (min != 0 || max != 0xFFFFFFFF || invert) {
143 printf("%s:%s%u ", name, inv, min);
145 printf("%ss:%s%u:%u ", name, inv, min, max);
150 print_len(const char *name, u_int32_t len, int invert)
152 const char *inv = invert ? "!" : "";
154 if (len != 0 || invert)
155 printf("%s:%s%u ", name, inv, len);
158 /* Prints out the union ip6t_matchinfo. */
160 print(const struct ip6t_ip6 *ip,
161 const struct ip6t_entry_match *match, int numeric)
163 const struct ip6t_ah *ah = (struct ip6t_ah *)match->data;
166 print_spis("spi", ah->spis[0], ah->spis[1],
167 ah->invflags & IP6T_AH_INV_SPI);
168 print_len("length", ah->hdrlen,
169 ah->invflags & IP6T_AH_INV_LEN);
174 if (ah->invflags & ~IP6T_AH_INV_MASK)
175 printf("Unknown invflags: 0x%X ",
176 ah->invflags & ~IP6T_AH_INV_MASK);
179 /* Saves the union ip6t_matchinfo in parsable form to stdout. */
180 static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
182 const struct ip6t_ah *ahinfo = (struct ip6t_ah *)match->data;
184 if (!(ahinfo->spis[0] == 0
185 && ahinfo->spis[1] == 0xFFFFFFFF)) {
187 (ahinfo->invflags & IP6T_AH_INV_SPI) ? "! " : "");
198 if (ahinfo->hdrlen != 0 || (ahinfo->invflags & IP6T_AH_INV_LEN) ) {
199 printf("--ahlen %s%u ",
200 (ahinfo->invflags & IP6T_AH_INV_LEN) ? "! " : "",
204 if (ahinfo->hdrres != 0 )
209 struct ip6tables_match ah = {
211 .version = IPTABLES_VERSION,
212 .size = IP6T_ALIGN(sizeof(struct ip6t_ah)),
213 .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_ah)),
217 .final_check = &final_check,
226 register_match6(&ah);