diff options
Diffstat (limited to 'extensions/libip6t_SNAT.c')
| -rw-r--r-- | extensions/libip6t_SNAT.c | 308 |
1 files changed, 0 insertions, 308 deletions
diff --git a/extensions/libip6t_SNAT.c b/extensions/libip6t_SNAT.c deleted file mode 100644 index 4fe272b2..00000000 --- a/extensions/libip6t_SNAT.c +++ /dev/null @@ -1,308 +0,0 @@ -/* - * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> - * - * Based on Rusty Russell's IPv4 SNAT target. Development of IPv6 NAT - * funded by Astaro. - */ - -#include <stdio.h> -#include <netdb.h> -#include <string.h> -#include <stdlib.h> -#include <xtables.h> -#include <iptables.h> -#include <limits.h> /* INT_MAX in ip_tables.h */ -#include <linux/netfilter_ipv6/ip6_tables.h> -#include <linux/netfilter/nf_nat.h> - -enum { - O_TO_SRC = 0, - O_RANDOM, - O_RANDOM_FULLY, - O_PERSISTENT, - F_TO_SRC = 1 << O_TO_SRC, - F_RANDOM = 1 << O_RANDOM, - F_RANDOM_FULLY = 1 << O_RANDOM_FULLY, -}; - -static void SNAT_help(void) -{ - printf( -"SNAT target options:\n" -" --to-source [<ipaddr>[-<ipaddr>]][:port[-port]]\n" -" Address to map source to.\n" -"[--random] [--random-fully] [--persistent]\n"); -} - -static const struct xt_option_entry SNAT_opts[] = { - {.name = "to-source", .id = O_TO_SRC, .type = XTTYPE_STRING, - .flags = XTOPT_MAND}, - {.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE}, - {.name = "random-fully", .id = O_RANDOM_FULLY, .type = XTTYPE_NONE}, - {.name = "persistent", .id = O_PERSISTENT, .type = XTTYPE_NONE}, - XTOPT_TABLEEND, -}; - -/* Ranges expected in network order. */ -static void -parse_to(const char *orig_arg, int portok, struct nf_nat_range *range) -{ - char *arg, *start, *end = NULL, *colon = NULL, *dash, *error; - const struct in6_addr *ip; - - arg = xtables_strdup(orig_arg); - - start = strchr(arg, '['); - if (start == NULL) { - start = arg; - /* Lets assume one colon is port information. Otherwise its an IPv6 address */ - colon = strchr(arg, ':'); - if (colon && strchr(colon+1, ':')) - colon = NULL; - } - else { - start++; - end = strchr(start, ']'); - if (end == NULL) - xtables_error(PARAMETER_PROBLEM, - "Invalid address format"); - - *end = '\0'; - colon = strchr(end + 1, ':'); - } - - 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; - - 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); - } - /* Starts with colon or [] colon? No IP info...*/ - if (colon == arg || colon == arg+2) { - free(arg); - return; - } - *colon = '\0'; - } - - range->flags |= NF_NAT_RANGE_MAP_IPS; - dash = strchr(start, '-'); - if (colon && dash && dash > colon) - dash = NULL; - - if (dash) - *dash = '\0'; - - ip = xtables_numeric_to_ip6addr(start); - if (!ip) - xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n", - start); - range->min_addr.in6 = *ip; - if (dash) { - ip = xtables_numeric_to_ip6addr(dash + 1); - if (!ip) - xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n", - dash+1); - range->max_addr.in6 = *ip; - } else - range->max_addr = range->min_addr; - - free(arg); - return; -} - -static void SNAT_parse(struct xt_option_call *cb) -{ - const struct ip6t_entry *entry = cb->xt_entry; - struct nf_nat_range *range = cb->data; - int portok; - - if (entry->ipv6.proto == IPPROTO_TCP || - entry->ipv6.proto == IPPROTO_UDP || - entry->ipv6.proto == IPPROTO_SCTP || - entry->ipv6.proto == IPPROTO_DCCP || - entry->ipv6.proto == IPPROTO_ICMP) - portok = 1; - else - portok = 0; - - xtables_option_parse(cb); - switch (cb->entry->id) { - case O_TO_SRC: - parse_to(cb->arg, portok, range); - break; - case O_PERSISTENT: - range->flags |= NF_NAT_RANGE_PERSISTENT; - break; - } -} - -static void SNAT_fcheck(struct xt_fcheck_call *cb) -{ - static const unsigned int f = F_TO_SRC | F_RANDOM; - static const unsigned int r = F_TO_SRC | F_RANDOM_FULLY; - struct nf_nat_range *range = cb->data; - - if ((cb->xflags & f) == f) - range->flags |= NF_NAT_RANGE_PROTO_RANDOM; - if ((cb->xflags & r) == r) - range->flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; -} - -static void print_range(const struct nf_nat_range *range) -{ - if (range->flags & NF_NAT_RANGE_MAP_IPS) { - if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) - printf("["); - printf("%s", xtables_ip6addr_to_numeric(&range->min_addr.in6)); - if (memcmp(&range->min_addr, &range->max_addr, - sizeof(range->min_addr))) - printf("-%s", xtables_ip6addr_to_numeric(&range->max_addr.in6)); - if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) - printf("]"); - } - 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)); - } -} - -static void SNAT_print(const void *ip, const struct xt_entry_target *target, - int numeric) -{ - const struct nf_nat_range *range = (const void *)target->data; - - printf(" to:"); - print_range(range); - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) - printf(" random"); - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) - printf(" random-fully"); - if (range->flags & NF_NAT_RANGE_PERSISTENT) - printf(" persistent"); -} - -static void SNAT_save(const void *ip, const struct xt_entry_target *target) -{ - const struct nf_nat_range *range = (const void *)target->data; - - printf(" --to-source "); - print_range(range); - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) - printf(" --random"); - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) - printf(" --random-fully"); - if (range->flags & NF_NAT_RANGE_PERSISTENT) - printf(" --persistent"); -} - -static void print_range_xlate(const struct nf_nat_range *range, - struct xt_xlate *xl) -{ - bool proto_specified = range->flags & NF_NAT_RANGE_PROTO_SPECIFIED; - - if (range->flags & NF_NAT_RANGE_MAP_IPS) { - xt_xlate_add(xl, "%s%s%s", - proto_specified ? "[" : "", - xtables_ip6addr_to_numeric(&range->min_addr.in6), - proto_specified ? "]" : ""); - - if (memcmp(&range->min_addr, &range->max_addr, - sizeof(range->min_addr))) { - xt_xlate_add(xl, "-%s%s%s", - proto_specified ? "[" : "", - xtables_ip6addr_to_numeric(&range->max_addr.in6), - proto_specified ? "]" : ""); - } - } - if (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)); - } -} - -static int SNAT_xlate(struct xt_xlate *xl, - const struct xt_xlate_tg_params *params) -{ - const struct nf_nat_range *range = (const void *)params->target->data; - bool sep_need = false; - const char *sep = " "; - - xt_xlate_add(xl, "snat to "); - print_range_xlate(range, xl); - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) { - xt_xlate_add(xl, " random"); - sep_need = true; - } - if (range->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) { - if (sep_need) - sep = ","; - xt_xlate_add(xl, "%sfully-random", sep); - 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 snat_tg_reg = { - .name = "SNAT", - .version = XTABLES_VERSION, - .family = NFPROTO_IPV6, - .revision = 1, - .size = XT_ALIGN(sizeof(struct nf_nat_range)), - .userspacesize = XT_ALIGN(sizeof(struct nf_nat_range)), - .help = SNAT_help, - .x6_parse = SNAT_parse, - .x6_fcheck = SNAT_fcheck, - .print = SNAT_print, - .save = SNAT_save, - .x6_options = SNAT_opts, - .xlate = SNAT_xlate, -}; - -void _init(void) -{ - xtables_register_target(&snat_tg_reg); -} |