| /* Shared library add-on to ip6tables to add Routing header support. */ |
| #include <stdio.h> |
| #include <netdb.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| #include <errno.h> |
| #include <xtables.h> |
| /*#include <linux/in6.h>*/ |
| #include <linux/netfilter_ipv6/ip6t_rt.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <arpa/inet.h> |
| |
| /*#define DEBUG 1*/ |
| |
| static void rt_help(void) |
| { |
| printf( |
| "rt match options:\n" |
| "[!] --rt-type type match the type\n" |
| "[!] --rt-segsleft num[:num] match the Segments Left field (range)\n" |
| "[!] --rt-len length total length of this header\n" |
| " --rt-0-res check the reserved filed, too (type 0)\n" |
| " --rt-0-addrs ADDR[,ADDR...] Type=0 addresses (list, max: %d)\n" |
| " --rt-0-not-strict List of Type=0 addresses not a strict list\n", |
| IP6T_RT_HOPS); |
| } |
| |
| static const struct option rt_opts[] = { |
| { "rt-type", 1, NULL, '1' }, |
| { "rt-segsleft", 1, NULL, '2' }, |
| { "rt-len", 1, NULL, '3' }, |
| { "rt-0-res", 0, NULL, '4' }, |
| { "rt-0-addrs", 1, NULL, '5' }, |
| { "rt-0-not-strict", 0, NULL, '6' }, |
| { .name = NULL } |
| }; |
| |
| static u_int32_t |
| parse_rt_num(const char *idstr, const char *typestr) |
| { |
| unsigned long int id; |
| char* ep; |
| |
| id = strtoul(idstr,&ep,0) ; |
| |
| if ( idstr == ep ) { |
| xtables_error(PARAMETER_PROBLEM, |
| "RT no valid digits in %s `%s'", typestr, idstr); |
| } |
| if ( id == ULONG_MAX && errno == ERANGE ) { |
| xtables_error(PARAMETER_PROBLEM, |
| "%s `%s' specified too big: would overflow", |
| typestr, idstr); |
| } |
| if ( *idstr != '\0' && *ep != '\0' ) { |
| xtables_error(PARAMETER_PROBLEM, |
| "RT error parsing %s `%s'", typestr, idstr); |
| } |
| return id; |
| } |
| |
| static void |
| parse_rt_segsleft(const char *idstring, u_int32_t *ids) |
| { |
| char *buffer; |
| char *cp; |
| |
| buffer = strdup(idstring); |
| if ((cp = strchr(buffer, ':')) == NULL) |
| ids[0] = ids[1] = parse_rt_num(buffer,"segsleft"); |
| else { |
| *cp = '\0'; |
| cp++; |
| |
| ids[0] = buffer[0] ? parse_rt_num(buffer,"segsleft") : 0; |
| ids[1] = cp[0] ? parse_rt_num(cp,"segsleft") : 0xFFFFFFFF; |
| } |
| free(buffer); |
| } |
| |
| static char * |
| addr_to_numeric(const struct in6_addr *addrp) |
| { |
| static char buf[50+1]; |
| return (char *)inet_ntop(AF_INET6, addrp, buf, sizeof(buf)); |
| } |
| |
| static struct in6_addr * |
| numeric_to_addr(const char *num) |
| { |
| static struct in6_addr ap; |
| int err; |
| |
| if ((err=inet_pton(AF_INET6, num, &ap)) == 1) |
| return ≈ |
| #ifdef DEBUG |
| fprintf(stderr, "\nnumeric2addr: %d\n", err); |
| #endif |
| xtables_error(PARAMETER_PROBLEM, "bad address: %s", num); |
| |
| return (struct in6_addr *)NULL; |
| } |
| |
| |
| static int |
| parse_addresses(const char *addrstr, struct in6_addr *addrp) |
| { |
| char *buffer, *cp, *next; |
| unsigned int i; |
| |
| buffer = strdup(addrstr); |
| if (!buffer) xtables_error(OTHER_PROBLEM, "strdup failed"); |
| |
| for (cp=buffer, i=0; cp && i<IP6T_RT_HOPS; cp=next,i++) |
| { |
| next=strchr(cp, ','); |
| if (next) *next++='\0'; |
| memcpy(&(addrp[i]), numeric_to_addr(cp), sizeof(struct in6_addr)); |
| #if DEBUG |
| printf("addr str: %s\n", cp); |
| printf("addr ip6: %s\n", addr_to_numeric((numeric_to_addr(cp)))); |
| printf("addr [%d]: %s\n", i, addr_to_numeric(&(addrp[i]))); |
| #endif |
| } |
| if (cp) xtables_error(PARAMETER_PROBLEM, "too many addresses specified"); |
| |
| free(buffer); |
| |
| #if DEBUG |
| printf("addr nr: %d\n", i); |
| #endif |
| |
| return i; |
| } |
| |
| static void rt_init(struct xt_entry_match *m) |
| { |
| struct ip6t_rt *rtinfo = (struct ip6t_rt *)m->data; |
| |
| rtinfo->rt_type = 0x0L; |
| rtinfo->segsleft[0] = 0x0L; |
| rtinfo->segsleft[1] = 0xFFFFFFFF; |
| rtinfo->hdrlen = 0; |
| rtinfo->flags = 0; |
| rtinfo->invflags = 0; |
| rtinfo->addrnr = 0; |
| } |
| |
| static int rt_parse(int c, char **argv, int invert, unsigned int *flags, |
| const void *entry, struct xt_entry_match **match) |
| { |
| struct ip6t_rt *rtinfo = (struct ip6t_rt *)(*match)->data; |
| |
| switch (c) { |
| case '1': |
| if (*flags & IP6T_RT_TYP) |
| xtables_error(PARAMETER_PROBLEM, |
| "Only one `--rt-type' allowed"); |
| xtables_check_inverse(optarg, &invert, &optind, 0); |
| rtinfo->rt_type = parse_rt_num(argv[optind-1], "type"); |
| if (invert) |
| rtinfo->invflags |= IP6T_RT_INV_TYP; |
| rtinfo->flags |= IP6T_RT_TYP; |
| *flags |= IP6T_RT_TYP; |
| break; |
| case '2': |
| if (*flags & IP6T_RT_SGS) |
| xtables_error(PARAMETER_PROBLEM, |
| "Only one `--rt-segsleft' allowed"); |
| xtables_check_inverse(optarg, &invert, &optind, 0); |
| parse_rt_segsleft(argv[optind-1], rtinfo->segsleft); |
| if (invert) |
| rtinfo->invflags |= IP6T_RT_INV_SGS; |
| rtinfo->flags |= IP6T_RT_SGS; |
| *flags |= IP6T_RT_SGS; |
| break; |
| case '3': |
| if (*flags & IP6T_RT_LEN) |
| xtables_error(PARAMETER_PROBLEM, |
| "Only one `--rt-len' allowed"); |
| xtables_check_inverse(optarg, &invert, &optind, 0); |
| rtinfo->hdrlen = parse_rt_num(argv[optind-1], "length"); |
| if (invert) |
| rtinfo->invflags |= IP6T_RT_INV_LEN; |
| rtinfo->flags |= IP6T_RT_LEN; |
| *flags |= IP6T_RT_LEN; |
| break; |
| case '4': |
| if (*flags & IP6T_RT_RES) |
| xtables_error(PARAMETER_PROBLEM, |
| "Only one `--rt-0-res' allowed"); |
| if ( !(*flags & IP6T_RT_TYP) || (rtinfo->rt_type != 0) || (rtinfo->invflags & IP6T_RT_INV_TYP) ) |
| xtables_error(PARAMETER_PROBLEM, |
| "`--rt-type 0' required before `--rt-0-res'"); |
| rtinfo->flags |= IP6T_RT_RES; |
| *flags |= IP6T_RT_RES; |
| break; |
| case '5': |
| if (*flags & IP6T_RT_FST) |
| xtables_error(PARAMETER_PROBLEM, |
| "Only one `--rt-0-addrs' allowed"); |
| if ( !(*flags & IP6T_RT_TYP) || (rtinfo->rt_type != 0) || (rtinfo->invflags & IP6T_RT_INV_TYP) ) |
| xtables_error(PARAMETER_PROBLEM, |
| "`--rt-type 0' required before `--rt-0-addrs'"); |
| xtables_check_inverse(optarg, &invert, &optind, 0); |
| if (invert) |
| xtables_error(PARAMETER_PROBLEM, |
| " '!' not allowed with `--rt-0-addrs'"); |
| rtinfo->addrnr = parse_addresses(argv[optind-1], rtinfo->addrs); |
| rtinfo->flags |= IP6T_RT_FST; |
| *flags |= IP6T_RT_FST; |
| break; |
| case '6': |
| if (*flags & IP6T_RT_FST_NSTRICT) |
| xtables_error(PARAMETER_PROBLEM, |
| "Only one `--rt-0-not-strict' allowed"); |
| if ( !(*flags & IP6T_RT_FST) ) |
| xtables_error(PARAMETER_PROBLEM, |
| "`--rt-0-addr ...' required before `--rt-0-not-strict'"); |
| rtinfo->flags |= IP6T_RT_FST_NSTRICT; |
| *flags |= IP6T_RT_FST_NSTRICT; |
| break; |
| default: |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static void |
| print_nums(const char *name, u_int32_t min, u_int32_t max, |
| int invert) |
| { |
| const char *inv = invert ? "!" : ""; |
| |
| if (min != 0 || max != 0xFFFFFFFF || invert) { |
| printf("%s", name); |
| if (min == max) { |
| printf(":%s", inv); |
| printf("%u", min); |
| } else { |
| printf("s:%s", inv); |
| printf("%u",min); |
| printf(":"); |
| printf("%u",max); |
| } |
| printf(" "); |
| } |
| } |
| |
| static void |
| print_addresses(unsigned int addrnr, struct in6_addr *addrp) |
| { |
| unsigned int i; |
| |
| for(i=0; i<addrnr; i++){ |
| printf("%s%c", addr_to_numeric(&(addrp[i])), (i!=addrnr-1)?',':' '); |
| } |
| } |
| |
| static void rt_print(const void *ip, const struct xt_entry_match *match, |
| int numeric) |
| { |
| const struct ip6t_rt *rtinfo = (struct ip6t_rt *)match->data; |
| |
| printf("rt "); |
| if (rtinfo->flags & IP6T_RT_TYP) |
| printf("type:%s%d ", rtinfo->invflags & IP6T_RT_INV_TYP ? "!" : "", |
| rtinfo->rt_type); |
| print_nums("segsleft", rtinfo->segsleft[0], rtinfo->segsleft[1], |
| rtinfo->invflags & IP6T_RT_INV_SGS); |
| if (rtinfo->flags & IP6T_RT_LEN) { |
| printf("length"); |
| printf(":%s", rtinfo->invflags & IP6T_RT_INV_LEN ? "!" : ""); |
| printf("%u", rtinfo->hdrlen); |
| printf(" "); |
| } |
| if (rtinfo->flags & IP6T_RT_RES) printf("reserved "); |
| if (rtinfo->flags & IP6T_RT_FST) printf("0-addrs "); |
| print_addresses(rtinfo->addrnr, (struct in6_addr *)rtinfo->addrs); |
| if (rtinfo->flags & IP6T_RT_FST_NSTRICT) printf("0-not-strict "); |
| if (rtinfo->invflags & ~IP6T_RT_INV_MASK) |
| printf("Unknown invflags: 0x%X ", |
| rtinfo->invflags & ~IP6T_RT_INV_MASK); |
| } |
| |
| static void rt_save(const void *ip, const struct xt_entry_match *match) |
| { |
| const struct ip6t_rt *rtinfo = (struct ip6t_rt *)match->data; |
| |
| if (rtinfo->flags & IP6T_RT_TYP) { |
| printf("%s--rt-type %u ", |
| (rtinfo->invflags & IP6T_RT_INV_TYP) ? "! " : "", |
| rtinfo->rt_type); |
| } |
| |
| if (!(rtinfo->segsleft[0] == 0 |
| && rtinfo->segsleft[1] == 0xFFFFFFFF)) { |
| printf("%s--rt-segsleft ", |
| (rtinfo->invflags & IP6T_RT_INV_SGS) ? "! " : ""); |
| if (rtinfo->segsleft[0] |
| != rtinfo->segsleft[1]) |
| printf("%u:%u ", |
| rtinfo->segsleft[0], |
| rtinfo->segsleft[1]); |
| else |
| printf("%u ", |
| rtinfo->segsleft[0]); |
| } |
| |
| if (rtinfo->flags & IP6T_RT_LEN) { |
| printf("%s--rt-len %u ", |
| (rtinfo->invflags & IP6T_RT_INV_LEN) ? "! " : "", |
| rtinfo->hdrlen); |
| } |
| |
| if (rtinfo->flags & IP6T_RT_RES) printf("--rt-0-res "); |
| if (rtinfo->flags & IP6T_RT_FST) printf("--rt-0-addrs "); |
| print_addresses(rtinfo->addrnr, (struct in6_addr *)rtinfo->addrs); |
| if (rtinfo->flags & IP6T_RT_FST_NSTRICT) printf("--rt-0-not-strict "); |
| |
| } |
| |
| static struct xtables_match rt_mt6_reg = { |
| .name = "rt", |
| .version = XTABLES_VERSION, |
| .family = NFPROTO_IPV6, |
| .size = XT_ALIGN(sizeof(struct ip6t_rt)), |
| .userspacesize = XT_ALIGN(sizeof(struct ip6t_rt)), |
| .help = rt_help, |
| .init = rt_init, |
| .parse = rt_parse, |
| .print = rt_print, |
| .save = rt_save, |
| .extra_opts = rt_opts, |
| }; |
| |
| void |
| _init(void) |
| { |
| xtables_register_match(&rt_mt6_reg); |
| } |