Jan Engelhardt | ddac6c5 | 2008-09-01 14:22:19 +0200 | [diff] [blame] | 1 | /* Shared library add-on to ip6tables to add Hop-by-Hop header support. */ |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 2 | #include <stdio.h> |
| 3 | #include <netdb.h> |
| 4 | #include <string.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <getopt.h> |
| 7 | #include <errno.h> |
Jan Engelhardt | 5d9678a | 2008-11-20 10:15:35 +0100 | [diff] [blame] | 8 | #include <xtables.h> |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 9 | /*#include <linux/in6.h>*/ |
| 10 | #include <linux/netfilter_ipv6/ip6t_opts.h> |
| 11 | #include <sys/types.h> |
| 12 | #include <sys/socket.h> |
| 13 | #include <arpa/inet.h> |
Jan Engelhardt | ddac6c5 | 2008-09-01 14:22:19 +0200 | [diff] [blame] | 14 | |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 15 | #define DEBUG 0 |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 16 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 17 | static void hbh_help(void) |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 18 | { |
| 19 | printf( |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 20 | "hbh match options:\n" |
Jan Engelhardt | 9672792 | 2008-08-13 14:42:41 +0200 | [diff] [blame] | 21 | "[!] --hbh-len length total length of this header\n" |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 22 | " --hbh-opts TYPE[:LEN][,TYPE[:LEN]...] \n" |
| 23 | " Options and its length (list, max: %d)\n", |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 24 | IP6T_OPTS_OPTSNR); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 25 | } |
| 26 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 27 | static const struct option hbh_opts[] = { |
Patrick McHardy | 500f483 | 2007-09-08 15:59:04 +0000 | [diff] [blame] | 28 | { "hbh-len", 1, NULL, '1' }, |
| 29 | { "hbh-opts", 1, NULL, '2' }, |
| 30 | { "hbh-not-strict", 1, NULL, '3' }, |
Max Kellermann | 9ee386a | 2008-01-29 13:48:05 +0000 | [diff] [blame] | 31 | { .name = NULL } |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 32 | }; |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 33 | |
| 34 | static u_int32_t |
| 35 | parse_opts_num(const char *idstr, const char *typestr) |
| 36 | { |
| 37 | unsigned long int id; |
| 38 | char* ep; |
| 39 | |
| 40 | id = strtoul(idstr,&ep,0) ; |
| 41 | |
| 42 | if ( idstr == ep ) { |
| 43 | exit_error(PARAMETER_PROBLEM, |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 44 | "hbh: no valid digits in %s `%s'", typestr, idstr); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 45 | } |
| 46 | if ( id == ULONG_MAX && errno == ERANGE ) { |
| 47 | exit_error(PARAMETER_PROBLEM, |
| 48 | "%s `%s' specified too big: would overflow", |
| 49 | typestr, idstr); |
| 50 | } |
| 51 | if ( *idstr != '\0' && *ep != '\0' ) { |
| 52 | exit_error(PARAMETER_PROBLEM, |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 53 | "hbh: error parsing %s `%s'", typestr, idstr); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 54 | } |
Jan Engelhardt | 213e185 | 2009-01-27 17:24:34 +0100 | [diff] [blame] | 55 | return id; |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | static int |
| 59 | parse_options(const char *optsstr, u_int16_t *opts) |
| 60 | { |
| 61 | char *buffer, *cp, *next, *range; |
| 62 | unsigned int i; |
| 63 | |
| 64 | buffer = strdup(optsstr); |
| 65 | if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed"); |
| 66 | |
| 67 | for (cp=buffer, i=0; cp && i<IP6T_OPTS_OPTSNR; cp=next,i++) |
| 68 | { |
| 69 | next=strchr(cp, ','); |
| 70 | if (next) *next++='\0'; |
| 71 | range = strchr(cp, ':'); |
| 72 | if (range) { |
| 73 | if (i == IP6T_OPTS_OPTSNR-1) |
| 74 | exit_error(PARAMETER_PROBLEM, |
| 75 | "too many ports specified"); |
| 76 | *range++ = '\0'; |
| 77 | } |
Jan Engelhardt | 213e185 | 2009-01-27 17:24:34 +0100 | [diff] [blame] | 78 | opts[i] = (parse_opts_num(cp, "opt") & 0xFF) << 8; |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 79 | if (range) { |
| 80 | if (opts[i] == 0) |
| 81 | exit_error(PARAMETER_PROBLEM, "PAD0 hasn't got length"); |
Jan Engelhardt | 213e185 | 2009-01-27 17:24:34 +0100 | [diff] [blame] | 82 | opts[i] |= parse_opts_num(range, "length") & 0xFF; |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 83 | } else { |
| 84 | opts[i] |= (0x00FF); |
| 85 | } |
| 86 | |
| 87 | #if DEBUG |
| 88 | printf("opts str: %s %s\n", cp, range); |
| 89 | printf("opts opt: %04X\n", opts[i]); |
| 90 | #endif |
| 91 | } |
| 92 | if (cp) exit_error(PARAMETER_PROBLEM, "too many addresses specified"); |
| 93 | |
| 94 | free(buffer); |
| 95 | |
| 96 | #if DEBUG |
| 97 | printf("addr nr: %d\n", i); |
| 98 | #endif |
| 99 | |
| 100 | return i; |
| 101 | } |
| 102 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 103 | static void hbh_init(struct xt_entry_match *m) |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 104 | { |
| 105 | struct ip6t_opts *optinfo = (struct ip6t_opts *)m->data; |
| 106 | |
| 107 | optinfo->hdrlen = 0; |
| 108 | optinfo->flags = 0; |
| 109 | optinfo->invflags = 0; |
| 110 | optinfo->optsnr = 0; |
| 111 | } |
| 112 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 113 | static int hbh_parse(int c, char **argv, int invert, unsigned int *flags, |
| 114 | const void *entry, struct xt_entry_match **match) |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 115 | { |
| 116 | struct ip6t_opts *optinfo = (struct ip6t_opts *)(*match)->data; |
| 117 | |
| 118 | switch (c) { |
| 119 | case '1': |
| 120 | if (*flags & IP6T_OPTS_LEN) |
| 121 | exit_error(PARAMETER_PROBLEM, |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 122 | "Only one `--hbh-len' allowed"); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 123 | check_inverse(optarg, &invert, &optind, 0); |
| 124 | optinfo->hdrlen = parse_opts_num(argv[optind-1], "length"); |
| 125 | if (invert) |
| 126 | optinfo->invflags |= IP6T_OPTS_INV_LEN; |
| 127 | optinfo->flags |= IP6T_OPTS_LEN; |
| 128 | *flags |= IP6T_OPTS_LEN; |
| 129 | break; |
| 130 | case '2': |
| 131 | if (*flags & IP6T_OPTS_OPTS) |
| 132 | exit_error(PARAMETER_PROBLEM, |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 133 | "Only one `--hbh-opts' allowed"); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 134 | check_inverse(optarg, &invert, &optind, 0); |
| 135 | if (invert) |
| 136 | exit_error(PARAMETER_PROBLEM, |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 137 | " '!' not allowed with `--hbh-opts'"); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 138 | optinfo->optsnr = parse_options(argv[optind-1], optinfo->opts); |
| 139 | optinfo->flags |= IP6T_OPTS_OPTS; |
| 140 | *flags |= IP6T_OPTS_OPTS; |
| 141 | break; |
| 142 | case '3': |
| 143 | if (*flags & IP6T_OPTS_NSTRICT) |
| 144 | exit_error(PARAMETER_PROBLEM, |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 145 | "Only one `--hbh-not-strict' allowed"); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 146 | if ( !(*flags & IP6T_OPTS_OPTS) ) |
| 147 | exit_error(PARAMETER_PROBLEM, |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 148 | "`--hbh-opts ...' required before `--hbh-not-strict'"); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 149 | optinfo->flags |= IP6T_OPTS_NSTRICT; |
| 150 | *flags |= IP6T_OPTS_NSTRICT; |
| 151 | break; |
| 152 | default: |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | return 1; |
| 157 | } |
| 158 | |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 159 | static void |
Jan Engelhardt | 7a236f4 | 2008-03-03 12:30:41 +0100 | [diff] [blame] | 160 | print_options(unsigned int optsnr, u_int16_t *optsp) |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 161 | { |
| 162 | unsigned int i; |
| 163 | |
| 164 | for(i=0; i<optsnr; i++){ |
| 165 | printf("%d", (optsp[i] & 0xFF00)>>8); |
| 166 | if ((optsp[i] & 0x00FF) != 0x00FF){ |
| 167 | printf(":%d", (optsp[i] & 0x00FF)); |
| 168 | } |
| 169 | printf("%c", (i!=optsnr-1)?',':' '); |
| 170 | } |
| 171 | } |
| 172 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 173 | static void hbh_print(const void *ip, const struct xt_entry_match *match, |
| 174 | int numeric) |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 175 | { |
| 176 | const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data; |
| 177 | |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 178 | printf("hbh "); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 179 | if (optinfo->flags & IP6T_OPTS_LEN) { |
| 180 | printf("length"); |
| 181 | printf(":%s", optinfo->invflags & IP6T_OPTS_INV_LEN ? "!" : ""); |
| 182 | printf("%u", optinfo->hdrlen); |
| 183 | printf(" "); |
| 184 | } |
| 185 | if (optinfo->flags & IP6T_OPTS_OPTS) printf("opts "); |
Fabrice MARIE | ae31bb6 | 2002-06-14 07:38:16 +0000 | [diff] [blame] | 186 | print_options(optinfo->optsnr, (u_int16_t *)optinfo->opts); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 187 | if (optinfo->flags & IP6T_OPTS_NSTRICT) printf("not-strict "); |
| 188 | if (optinfo->invflags & ~IP6T_OPTS_INV_MASK) |
| 189 | printf("Unknown invflags: 0x%X ", |
| 190 | optinfo->invflags & ~IP6T_OPTS_INV_MASK); |
| 191 | } |
| 192 | |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 193 | static void hbh_save(const void *ip, const struct xt_entry_match *match) |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 194 | { |
| 195 | const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data; |
| 196 | |
| 197 | if (optinfo->flags & IP6T_OPTS_LEN) { |
Jan Engelhardt | cea9f71 | 2008-12-09 15:06:20 +0100 | [diff] [blame] | 198 | printf("%s--hbh-len %u ", |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 199 | (optinfo->invflags & IP6T_OPTS_INV_LEN) ? "! " : "", |
| 200 | optinfo->hdrlen); |
| 201 | } |
| 202 | |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 203 | if (optinfo->flags & IP6T_OPTS_OPTS) |
| 204 | printf("--hbh-opts "); |
Fabrice MARIE | ae31bb6 | 2002-06-14 07:38:16 +0000 | [diff] [blame] | 205 | print_options(optinfo->optsnr, (u_int16_t *)optinfo->opts); |
Jan Engelhardt | e2f588a | 2007-10-04 16:30:40 +0000 | [diff] [blame] | 206 | if (optinfo->flags & IP6T_OPTS_NSTRICT) |
| 207 | printf("--hbh-not-strict "); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 208 | } |
| 209 | |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 210 | static struct xtables_match hbh_mt6_reg = { |
Harald Welte | 02aa733 | 2005-02-01 15:38:20 +0000 | [diff] [blame] | 211 | .name = "hbh", |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 212 | .version = XTABLES_VERSION, |
Jan Engelhardt | 03d9948 | 2008-11-18 12:27:54 +0100 | [diff] [blame] | 213 | .family = NFPROTO_IPV6, |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 214 | .size = XT_ALIGN(sizeof(struct ip6t_opts)), |
| 215 | .userspacesize = XT_ALIGN(sizeof(struct ip6t_opts)), |
Jan Engelhardt | 997045f | 2007-10-04 16:29:21 +0000 | [diff] [blame] | 216 | .help = hbh_help, |
| 217 | .init = hbh_init, |
| 218 | .parse = hbh_parse, |
| 219 | .print = hbh_print, |
| 220 | .save = hbh_save, |
| 221 | .extra_opts = hbh_opts, |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 222 | }; |
| 223 | |
| 224 | void |
| 225 | _init(void) |
| 226 | { |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 227 | xtables_register_match(&hbh_mt6_reg); |
András Kis-Szabó | 2ea5649 | 2002-04-29 13:51:37 +0000 | [diff] [blame] | 228 | } |