diff options
Diffstat (limited to 'extensions/libipt_DNAT.c')
-rw-r--r-- | extensions/libipt_DNAT.c | 555 |
1 files changed, 0 insertions, 555 deletions
diff --git a/extensions/libipt_DNAT.c b/extensions/libipt_DNAT.c deleted file mode 100644 index 4907a2e8..00000000 --- a/extensions/libipt_DNAT.c +++ /dev/null @@ -1,555 +0,0 @@ -#include <stdio.h> -#include <netdb.h> -#include <string.h> -#include <stdlib.h> -#include <xtables.h> -#include <iptables.h> /* get_kernel_version */ -#include <limits.h> /* INT_MAX in ip_tables.h */ -#include <linux/netfilter_ipv4/ip_tables.h> -#include <linux/netfilter/nf_nat.h> - -enum { - O_TO_DEST = 0, - O_RANDOM, - O_PERSISTENT, - O_X_TO_DEST, /* hidden flag */ - F_TO_DEST = 1 << O_TO_DEST, - F_RANDOM = 1 << O_RANDOM, - F_X_TO_DEST = 1 << O_X_TO_DEST, -}; - -/* Dest NAT data consists of a multi-range, indicating where to map - to. */ -struct ipt_natinfo -{ - struct xt_entry_target t; - struct nf_nat_ipv4_multi_range_compat mr; -}; - -static void DNAT_help(void) -{ - printf( -"DNAT target options:\n" -" --to-destination [<ipaddr>[-<ipaddr>]][:port[-port]]\n" -" Address to map destination to.\n" -"[--random] [--persistent]\n"); -} - -static void DNAT_help_v2(void) -{ - printf( -"DNAT target options:\n" -" --to-destination [<ipaddr>[-<ipaddr>]][:port[-port[/port]]]\n" -" Address to map destination to.\n" -"[--random] [--persistent]\n"); -} - -static const struct xt_option_entry DNAT_opts[] = { - {.name = "to-destination", .id = O_TO_DEST, .type = XTTYPE_STRING, - .flags = XTOPT_MAND | XTOPT_MULTI}, - {.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE}, - {.name = "persistent", .id = O_PERSISTENT, .type = XTTYPE_NONE}, - XTOPT_TABLEEND, -}; - -static struct ipt_natinfo * -append_range(struct ipt_natinfo *info, const struct nf_nat_ipv4_range *range) -{ - unsigned int size; - - /* One rangesize already in struct ipt_natinfo */ - size = XT_ALIGN(sizeof(*info) + info->mr.rangesize * sizeof(*range)); - - info = realloc(info, size); - if (!info) - xtables_error(OTHER_PROBLEM, "Out of memory\n"); - - info->t.u.target_size = size; - info->mr.range[info->mr.rangesize] = *range; - info->mr.rangesize++; - - return info; -} - -/* Ranges expected in network order. */ -static struct xt_entry_target * -parse_to(const char *orig_arg, int portok, struct ipt_natinfo *info) -{ - struct nf_nat_ipv4_range range; - char *arg, *colon, *dash, *error; - const struct in_addr *ip; - - arg = strdup(orig_arg); - if (arg == NULL) - xtables_error(RESOURCE_PROBLEM, "strdup"); - memset(&range, 0, sizeof(range)); - colon = strchr(arg, ':'); - - if (colon) { - int port; - - if (!portok) - xtables_error(PARAMETER_PROBLEM, - "Need TCP, UDP, SCTP or DCCP with port specification"); - - range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; - - port = atoi(colon+1); - if (port <= 0 || port > 65535) - xtables_error(PARAMETER_PROBLEM, - "Port `%s' not valid\n", colon+1); - - error = strchr(colon+1, ':'); - if (error) - xtables_error(PARAMETER_PROBLEM, - "Invalid port:port syntax - use dash\n"); - - dash = strchr(colon, '-'); - if (!dash) { - range.min.tcp.port - = range.max.tcp.port - = htons(port); - } else { - int maxport; - - maxport = atoi(dash + 1); - if (maxport <= 0 || maxport > 65535) - xtables_error(PARAMETER_PROBLEM, - "Port `%s' not valid\n", dash+1); - if (maxport < port) - /* People are stupid. */ - xtables_error(PARAMETER_PROBLEM, - "Port range `%s' funky\n", colon+1); - range.min.tcp.port = htons(port); - range.max.tcp.port = htons(maxport); - } - /* Starts with a colon? No IP info...*/ - if (colon == arg) { - free(arg); - return &(append_range(info, &range)->t); - } - *colon = '\0'; - } - - range.flags |= NF_NAT_RANGE_MAP_IPS; - dash = strchr(arg, '-'); - if (colon && dash && dash > colon) - dash = NULL; - - if (dash) - *dash = '\0'; - - ip = xtables_numeric_to_ipaddr(arg); - if (!ip) - xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n", - arg); - range.min_ip = ip->s_addr; - if (dash) { - ip = xtables_numeric_to_ipaddr(dash+1); - if (!ip) - xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n", - dash+1); - range.max_ip = ip->s_addr; - } else - range.max_ip = range.min_ip; - - free(arg); - return &(append_range(info, &range)->t); -} - -static void DNAT_parse(struct xt_option_call *cb) -{ - const struct ipt_entry *entry = cb->xt_entry; - struct ipt_natinfo *info = (void *)(*cb->target); - int portok; - - if (entry->ip.proto == IPPROTO_TCP - || entry->ip.proto == IPPROTO_UDP - || entry->ip.proto == IPPROTO_SCTP - || entry->ip.proto == IPPROTO_DCCP - || entry->ip.proto == IPPROTO_ICMP) - portok = 1; - else - portok = 0; - - xtables_option_parse(cb); - switch (cb->entry->id) { - case O_TO_DEST: - if (cb->xflags & F_X_TO_DEST) { - if (!kernel_version) - get_kernel_version(); - if (kernel_version > LINUX_VERSION(2, 6, 10)) - xtables_error(PARAMETER_PROBLEM, - "DNAT: Multiple --to-destination not supported"); - } - *cb->target = parse_to(cb->arg, portok, info); - cb->xflags |= F_X_TO_DEST; - break; - case O_PERSISTENT: - info->mr.range[0].flags |= NF_NAT_RANGE_PERSISTENT; - break; - } -} - -static void DNAT_fcheck(struct xt_fcheck_call *cb) -{ - static const unsigned int f = F_TO_DEST | F_RANDOM; - struct nf_nat_ipv4_multi_range_compat *mr = cb->data; - - if ((cb->xflags & f) == f) - mr->range[0].flags |= NF_NAT_RANGE_PROTO_RANDOM; -} - -static void print_range(const struct nf_nat_ipv4_range *r) -{ - if (r->flags & NF_NAT_RANGE_MAP_IPS) { - struct in_addr a; - - a.s_addr = r->min_ip; - printf("%s", xtables_ipaddr_to_numeric(&a)); - if (r->max_ip != r->min_ip) { - a.s_addr = r->max_ip; - printf("-%s", xtables_ipaddr_to_numeric(&a)); - } - } - if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { - printf(":"); - printf("%hu", ntohs(r->min.tcp.port)); - if (r->max.tcp.port != r->min.tcp.port) - printf("-%hu", ntohs(r->max.tcp.port)); - } -} - -static void DNAT_print(const void *ip, const struct xt_entry_target *target, - int numeric) -{ - const struct ipt_natinfo *info = (const void *)target; - unsigned int i = 0; - - printf(" to:"); - for (i = 0; i < info->mr.rangesize; i++) { - print_range(&info->mr.range[i]); - if (info->mr.range[i].flags & NF_NAT_RANGE_PROTO_RANDOM) - printf(" random"); - if (info->mr.range[i].flags & NF_NAT_RANGE_PERSISTENT) - printf(" persistent"); - } -} - -static void DNAT_save(const void *ip, const struct xt_entry_target *target) -{ - const struct ipt_natinfo *info = (const void *)target; - unsigned int i = 0; - - for (i = 0; i < info->mr.rangesize; i++) { - printf(" --to-destination "); - print_range(&info->mr.range[i]); - if (info->mr.range[i].flags & NF_NAT_RANGE_PROTO_RANDOM) - printf(" --random"); - if (info->mr.range[i].flags & NF_NAT_RANGE_PERSISTENT) - printf(" --persistent"); - } -} - -static void print_range_xlate(const struct nf_nat_ipv4_range *r, - struct xt_xlate *xl) -{ - if (r->flags & NF_NAT_RANGE_MAP_IPS) { - struct in_addr a; - - a.s_addr = r->min_ip; - xt_xlate_add(xl, "%s", xtables_ipaddr_to_numeric(&a)); - if (r->max_ip != r->min_ip) { - a.s_addr = r->max_ip; - xt_xlate_add(xl, "-%s", xtables_ipaddr_to_numeric(&a)); - } - } - if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { - xt_xlate_add(xl, ":%hu", ntohs(r->min.tcp.port)); - if (r->max.tcp.port != r->min.tcp.port) - xt_xlate_add(xl, "-%hu", ntohs(r->max.tcp.port)); - } -} - -static int DNAT_xlate(struct xt_xlate *xl, - const struct xt_xlate_tg_params *params) -{ - const struct ipt_natinfo *info = (const void *)params->target; - unsigned int i = 0; - bool sep_need = false; - const char *sep = " "; - - for (i = 0; i < info->mr.rangesize; i++) { - xt_xlate_add(xl, "dnat to "); - print_range_xlate(&info->mr.range[i], xl); - if (info->mr.range[i].flags & NF_NAT_RANGE_PROTO_RANDOM) { - xt_xlate_add(xl, " random"); - sep_need = true; - } - if (info->mr.range[i].flags & NF_NAT_RANGE_PERSISTENT) { - if (sep_need) - sep = ","; - xt_xlate_add(xl, "%spersistent", sep); - } - } - - return 1; -} - -static void -parse_to_v2(const char *orig_arg, int portok, struct nf_nat_range2 *range) -{ - char *arg, *colon, *dash, *error; - const struct in_addr *ip; - - arg = strdup(orig_arg); - if (arg == NULL) - xtables_error(RESOURCE_PROBLEM, "strdup"); - - colon = strchr(arg, ':'); - if (colon) { - int port; - - if (!portok) - xtables_error(PARAMETER_PROBLEM, - "Need TCP, UDP, SCTP or DCCP with port specification"); - - range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED; - - port = atoi(colon+1); - if (port <= 0 || port > 65535) - xtables_error(PARAMETER_PROBLEM, - "Port `%s' not valid\n", colon+1); - - error = strchr(colon+1, ':'); - if (error) - xtables_error(PARAMETER_PROBLEM, - "Invalid port:port syntax - use dash\n"); - - dash = strchr(colon, '-'); - if (!dash) { - range->min_proto.tcp.port - = range->max_proto.tcp.port - = htons(port); - } else { - int maxport; - char *slash; - - maxport = atoi(dash + 1); - if (maxport <= 0 || maxport > 65535) - xtables_error(PARAMETER_PROBLEM, - "Port `%s' not valid\n", dash+1); - if (maxport < port) - /* People are stupid. */ - xtables_error(PARAMETER_PROBLEM, - "Port range `%s' funky\n", colon+1); - range->min_proto.tcp.port = htons(port); - range->max_proto.tcp.port = htons(maxport); - - slash = strchr(dash, '/'); - if (slash) { - int baseport; - - baseport = atoi(slash + 1); - if (baseport <= 0 || baseport > 65535) - xtables_error(PARAMETER_PROBLEM, - "Port `%s' not valid\n", slash+1); - range->flags |= NF_NAT_RANGE_PROTO_OFFSET; - range->base_proto.tcp.port = htons(baseport); - } - } - /* Starts with a colon? No IP info...*/ - if (colon == arg) { - free(arg); - return; - } - *colon = '\0'; - } - - range->flags |= NF_NAT_RANGE_MAP_IPS; - dash = strchr(arg, '-'); - if (colon && dash && dash > colon) - dash = NULL; - - if (dash) - *dash = '\0'; - - ip = xtables_numeric_to_ipaddr(arg); - if (!ip) - xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n", - arg); - range->min_addr.in = *ip; - if (dash) { - ip = xtables_numeric_to_ipaddr(dash+1); - if (!ip) - xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n", - dash+1); - range->max_addr.in = *ip; - } else - range->max_addr = range->min_addr; - - free(arg); - return; -} - -static void DNAT_parse_v2(struct xt_option_call *cb) -{ - const struct ipt_entry *entry = cb->xt_entry; - struct nf_nat_range2 *range = cb->data; - int portok; - - if (entry->ip.proto == IPPROTO_TCP - || entry->ip.proto == IPPROTO_UDP - || entry->ip.proto == IPPROTO_SCTP - || entry->ip.proto == IPPROTO_DCCP - || entry->ip.proto == IPPROTO_ICMP) - portok = 1; - else - portok = 0; - - xtables_option_parse(cb); - switch (cb->entry->id) { - case O_TO_DEST: - if (cb->xflags & F_X_TO_DEST) { - xtables_error(PARAMETER_PROBLEM, - "DNAT: Multiple --to-destination not supported"); - } - parse_to_v2(cb->arg, portok, range); - cb->xflags |= F_X_TO_DEST; - break; - case O_PERSISTENT: - range->flags |= NF_NAT_RANGE_PERSISTENT; - break; - } -} - -static void DNAT_fcheck_v2(struct xt_fcheck_call *cb) -{ - static const unsigned int f = F_TO_DEST | F_RANDOM; - struct nf_nat_range2 *range = cb->data; - - if ((cb->xflags & f) == f) - range->flags |= NF_NAT_RANGE_PROTO_RANDOM; -} - -static void print_range_v2(const struct nf_nat_range2 *range) -{ - if (range->flags & NF_NAT_RANGE_MAP_IPS) { - printf("%s", xtables_ipaddr_to_numeric(&range->min_addr.in)); - if (memcmp(&range->min_addr, &range->max_addr, - sizeof(range->min_addr))) - printf("-%s", xtables_ipaddr_to_numeric(&range->max_addr.in)); - } - if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { - printf(":"); - printf("%hu", ntohs(range->min_proto.tcp.port)); - if (range->max_proto.tcp.port != range->min_proto.tcp.port) - printf("-%hu", ntohs(range->max_proto.tcp.port)); - if (range->flags & NF_NAT_RANGE_PROTO_OFFSET) - printf("/%hu", ntohs(range->base_proto.tcp.port)); - } -} - -static void DNAT_print_v2(const void *ip, const struct xt_entry_target *target, - int numeric) -{ - const struct nf_nat_range2 *range = (const void *)target->data; - - printf(" to:"); - print_range_v2(range); - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) - printf(" random"); - if (range->flags & NF_NAT_RANGE_PERSISTENT) - printf(" persistent"); -} - -static void DNAT_save_v2(const void *ip, const struct xt_entry_target *target) -{ - const struct nf_nat_range2 *range = (const void *)target->data; - - printf(" --to-destination "); - print_range_v2(range); - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) - printf(" --random"); - if (range->flags & NF_NAT_RANGE_PERSISTENT) - printf(" --persistent"); -} - -static void print_range_xlate_v2(const struct nf_nat_range2 *range, - struct xt_xlate *xl) -{ - if (range->flags & NF_NAT_RANGE_MAP_IPS) { - xt_xlate_add(xl, "%s", xtables_ipaddr_to_numeric(&range->min_addr.in)); - if (memcmp(&range->min_addr, &range->max_addr, - sizeof(range->min_addr))) { - xt_xlate_add(xl, "-%s", xtables_ipaddr_to_numeric(&range->max_addr.in)); - } - } - if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { - xt_xlate_add(xl, ":%hu", ntohs(range->min_proto.tcp.port)); - if (range->max_proto.tcp.port != range->min_proto.tcp.port) - xt_xlate_add(xl, "-%hu", ntohs(range->max_proto.tcp.port)); - if (range->flags & NF_NAT_RANGE_PROTO_OFFSET) - xt_xlate_add(xl, ";%hu", ntohs(range->base_proto.tcp.port)); - } -} - -static int DNAT_xlate_v2(struct xt_xlate *xl, - const struct xt_xlate_tg_params *params) -{ - const struct nf_nat_range2 *range = (const void *)params->target->data; - bool sep_need = false; - const char *sep = " "; - - xt_xlate_add(xl, "dnat to "); - print_range_xlate_v2(range, xl); - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) { - xt_xlate_add(xl, " random"); - sep_need = true; - } - if (range->flags & NF_NAT_RANGE_PERSISTENT) { - if (sep_need) - sep = ","; - xt_xlate_add(xl, "%spersistent", sep); - } - - return 1; -} - -static struct xtables_target dnat_tg_reg[] = { - { - .name = "DNAT", - .version = XTABLES_VERSION, - .family = NFPROTO_IPV4, - .revision = 0, - .size = XT_ALIGN(sizeof(struct nf_nat_ipv4_multi_range_compat)), - .userspacesize = XT_ALIGN(sizeof(struct nf_nat_ipv4_multi_range_compat)), - .help = DNAT_help, - .print = DNAT_print, - .save = DNAT_save, - .x6_parse = DNAT_parse, - .x6_fcheck = DNAT_fcheck, - .x6_options = DNAT_opts, - .xlate = DNAT_xlate, - }, - { - .name = "DNAT", - .version = XTABLES_VERSION, - .family = NFPROTO_IPV4, - .revision = 2, - .size = XT_ALIGN(sizeof(struct nf_nat_range2)), - .userspacesize = XT_ALIGN(sizeof(struct nf_nat_range2)), - .help = DNAT_help_v2, - .print = DNAT_print_v2, - .save = DNAT_save_v2, - .x6_parse = DNAT_parse_v2, - .x6_fcheck = DNAT_fcheck_v2, - .x6_options = DNAT_opts, - .xlate = DNAT_xlate_v2, - }, -}; - -void _init(void) -{ - xtables_register_targets(dnat_tg_reg, ARRAY_SIZE(dnat_tg_reg)); -} |