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443 lines
12 KiB
443 lines
12 KiB
#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <xtables.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/xt_iprange.h>
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struct ipt_iprange {
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/* Inclusive: network order. */
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__be32 min_ip, max_ip;
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};
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struct ipt_iprange_info {
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struct ipt_iprange src;
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struct ipt_iprange dst;
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/* Flags from above */
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uint8_t flags;
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};
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enum {
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O_SRC_RANGE = 0,
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O_DST_RANGE,
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};
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static void iprange_mt_help(void)
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{
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printf(
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"iprange match options:\n"
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"[!] --src-range ip[-ip] Match source IP in the specified range\n"
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"[!] --dst-range ip[-ip] Match destination IP in the specified range\n");
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}
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static const struct xt_option_entry iprange_mt_opts[] = {
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{.name = "src-range", .id = O_SRC_RANGE, .type = XTTYPE_STRING,
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.flags = XTOPT_INVERT},
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{.name = "dst-range", .id = O_DST_RANGE, .type = XTTYPE_STRING,
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.flags = XTOPT_INVERT},
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XTOPT_TABLEEND,
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};
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static void
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iprange_parse_spec(const char *from, const char *to, union nf_inet_addr *range,
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uint8_t family, const char *optname)
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{
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const char *spec[2] = {from, to};
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struct in6_addr *ia6;
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struct in_addr *ia4;
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unsigned int i;
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memset(range, 0, sizeof(union nf_inet_addr) * 2);
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if (family == NFPROTO_IPV6) {
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for (i = 0; i < ARRAY_SIZE(spec); ++i) {
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ia6 = xtables_numeric_to_ip6addr(spec[i]);
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if (ia6 == NULL)
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xtables_param_act(XTF_BAD_VALUE, "iprange",
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optname, spec[i]);
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range[i].in6 = *ia6;
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}
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} else {
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for (i = 0; i < ARRAY_SIZE(spec); ++i) {
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ia4 = xtables_numeric_to_ipaddr(spec[i]);
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if (ia4 == NULL)
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xtables_param_act(XTF_BAD_VALUE, "iprange",
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optname, spec[i]);
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range[i].in = *ia4;
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}
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}
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}
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static void iprange_parse_range(const char *oarg, union nf_inet_addr *range,
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uint8_t family, const char *optname)
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{
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char *arg = strdup(oarg);
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char *dash;
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if (arg == NULL)
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xtables_error(RESOURCE_PROBLEM, "strdup");
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dash = strchr(arg, '-');
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if (dash == NULL) {
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iprange_parse_spec(arg, arg, range, family, optname);
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free(arg);
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return;
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}
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*dash = '\0';
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iprange_parse_spec(arg, dash + 1, range, family, optname);
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if (memcmp(&range[0], &range[1], sizeof(*range)) > 0)
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fprintf(stderr, "xt_iprange: range %s-%s is reversed and "
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"will never match\n", arg, dash + 1);
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free(arg);
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}
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static void iprange_parse(struct xt_option_call *cb)
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{
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struct ipt_iprange_info *info = cb->data;
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union nf_inet_addr range[2];
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_SRC_RANGE:
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info->flags |= IPRANGE_SRC;
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if (cb->invert)
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info->flags |= IPRANGE_SRC_INV;
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iprange_parse_range(cb->arg, range,
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NFPROTO_IPV4, "--src-range");
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info->src.min_ip = range[0].ip;
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info->src.max_ip = range[1].ip;
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break;
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case O_DST_RANGE:
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info->flags |= IPRANGE_DST;
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if (cb->invert)
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info->flags |= IPRANGE_DST_INV;
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iprange_parse_range(cb->arg, range,
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NFPROTO_IPV4, "--dst-range");
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info->dst.min_ip = range[0].ip;
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info->dst.max_ip = range[1].ip;
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break;
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}
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}
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static void iprange_mt_parse(struct xt_option_call *cb, uint8_t nfproto)
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{
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struct xt_iprange_mtinfo *info = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_SRC_RANGE:
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iprange_parse_range(cb->arg, &info->src_min, nfproto,
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"--src-range");
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info->flags |= IPRANGE_SRC;
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if (cb->invert)
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info->flags |= IPRANGE_SRC_INV;
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break;
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case O_DST_RANGE:
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iprange_parse_range(cb->arg, &info->dst_min, nfproto,
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"--dst-range");
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info->flags |= IPRANGE_DST;
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if (cb->invert)
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info->flags |= IPRANGE_DST_INV;
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break;
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}
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}
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static void iprange_mt4_parse(struct xt_option_call *cb)
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{
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iprange_mt_parse(cb, NFPROTO_IPV4);
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}
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static void iprange_mt6_parse(struct xt_option_call *cb)
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{
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iprange_mt_parse(cb, NFPROTO_IPV6);
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}
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static void iprange_mt_check(struct xt_fcheck_call *cb)
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{
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if (cb->xflags == 0)
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xtables_error(PARAMETER_PROBLEM,
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"iprange match: You must specify `--src-range' or `--dst-range'");
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}
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static void
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print_iprange(const struct ipt_iprange *range)
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{
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const unsigned char *byte_min, *byte_max;
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byte_min = (const unsigned char *)&range->min_ip;
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byte_max = (const unsigned char *)&range->max_ip;
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printf(" %u.%u.%u.%u-%u.%u.%u.%u",
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byte_min[0], byte_min[1], byte_min[2], byte_min[3],
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byte_max[0], byte_max[1], byte_max[2], byte_max[3]);
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}
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static void iprange_print(const void *ip, const struct xt_entry_match *match,
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int numeric)
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{
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const struct ipt_iprange_info *info = (const void *)match->data;
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if (info->flags & IPRANGE_SRC) {
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printf(" source IP range");
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if (info->flags & IPRANGE_SRC_INV)
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printf(" !");
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print_iprange(&info->src);
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}
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if (info->flags & IPRANGE_DST) {
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printf(" destination IP range");
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if (info->flags & IPRANGE_DST_INV)
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printf(" !");
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print_iprange(&info->dst);
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}
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}
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static void
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iprange_mt4_print(const void *ip, const struct xt_entry_match *match,
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int numeric)
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{
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const struct xt_iprange_mtinfo *info = (const void *)match->data;
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if (info->flags & IPRANGE_SRC) {
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printf(" source IP range");
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if (info->flags & IPRANGE_SRC_INV)
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printf(" !");
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/*
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* ipaddr_to_numeric() uses a static buffer, so cannot
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* combine the printf() calls.
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*/
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printf(" %s", xtables_ipaddr_to_numeric(&info->src_min.in));
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printf("-%s", xtables_ipaddr_to_numeric(&info->src_max.in));
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}
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if (info->flags & IPRANGE_DST) {
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printf(" destination IP range");
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if (info->flags & IPRANGE_DST_INV)
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printf(" !");
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printf(" %s", xtables_ipaddr_to_numeric(&info->dst_min.in));
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printf("-%s", xtables_ipaddr_to_numeric(&info->dst_max.in));
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}
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}
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static void
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iprange_mt6_print(const void *ip, const struct xt_entry_match *match,
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int numeric)
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{
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const struct xt_iprange_mtinfo *info = (const void *)match->data;
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if (info->flags & IPRANGE_SRC) {
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printf(" source IP range");
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if (info->flags & IPRANGE_SRC_INV)
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printf(" !");
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/*
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* ipaddr_to_numeric() uses a static buffer, so cannot
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* combine the printf() calls.
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*/
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printf(" %s", xtables_ip6addr_to_numeric(&info->src_min.in6));
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printf("-%s", xtables_ip6addr_to_numeric(&info->src_max.in6));
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}
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if (info->flags & IPRANGE_DST) {
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printf(" destination IP range");
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if (info->flags & IPRANGE_DST_INV)
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printf(" !");
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printf(" %s", xtables_ip6addr_to_numeric(&info->dst_min.in6));
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printf("-%s", xtables_ip6addr_to_numeric(&info->dst_max.in6));
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}
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}
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static void iprange_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct ipt_iprange_info *info = (const void *)match->data;
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if (info->flags & IPRANGE_SRC) {
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if (info->flags & IPRANGE_SRC_INV)
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printf(" !");
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printf(" --src-range");
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print_iprange(&info->src);
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}
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if (info->flags & IPRANGE_DST) {
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if (info->flags & IPRANGE_DST_INV)
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printf(" !");
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printf(" --dst-range");
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print_iprange(&info->dst);
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}
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}
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static void iprange_mt4_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_iprange_mtinfo *info = (const void *)match->data;
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if (info->flags & IPRANGE_SRC) {
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if (info->flags & IPRANGE_SRC_INV)
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printf(" !");
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printf(" --src-range %s",
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xtables_ipaddr_to_numeric(&info->src_min.in));
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printf("-%s", xtables_ipaddr_to_numeric(&info->src_max.in));
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}
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if (info->flags & IPRANGE_DST) {
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if (info->flags & IPRANGE_DST_INV)
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printf(" !");
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printf(" --dst-range %s",
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xtables_ipaddr_to_numeric(&info->dst_min.in));
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printf("-%s", xtables_ipaddr_to_numeric(&info->dst_max.in));
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}
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}
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static void iprange_mt6_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_iprange_mtinfo *info = (const void *)match->data;
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if (info->flags & IPRANGE_SRC) {
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if (info->flags & IPRANGE_SRC_INV)
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printf(" !");
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printf(" --src-range %s",
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xtables_ip6addr_to_numeric(&info->src_min.in6));
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printf("-%s", xtables_ip6addr_to_numeric(&info->src_max.in6));
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}
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if (info->flags & IPRANGE_DST) {
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if (info->flags & IPRANGE_DST_INV)
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printf(" !");
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printf(" --dst-range %s",
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xtables_ip6addr_to_numeric(&info->dst_min.in6));
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printf("-%s", xtables_ip6addr_to_numeric(&info->dst_max.in6));
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}
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}
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static void
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print_iprange_xlate(const struct ipt_iprange *range,
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struct xt_xlate *xl)
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{
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const unsigned char *byte_min, *byte_max;
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byte_min = (const unsigned char *)&range->min_ip;
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byte_max = (const unsigned char *)&range->max_ip;
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xt_xlate_add(xl, " %u.%u.%u.%u-%u.%u.%u.%u ",
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byte_min[0], byte_min[1], byte_min[2], byte_min[3],
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byte_max[0], byte_max[1], byte_max[2], byte_max[3]);
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}
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static int iprange_xlate(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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const struct ipt_iprange_info *info = (const void *)params->match->data;
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char *space = "";
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if (info->flags & IPRANGE_SRC) {
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xt_xlate_add(xl, "ip saddr%s",
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info->flags & IPRANGE_SRC_INV ? " !=" : "");
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print_iprange_xlate(&info->src, xl);
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space = " ";
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}
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if (info->flags & IPRANGE_DST) {
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xt_xlate_add(xl, "%sip daddr%s", space,
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info->flags & IPRANGE_DST_INV ? " !=" : "");
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print_iprange_xlate(&info->dst, xl);
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}
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return 1;
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}
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static int iprange_mt4_xlate(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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const struct xt_iprange_mtinfo *info =
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(const void *)params->match->data;
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char *space = "";
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if (info->flags & IPRANGE_SRC) {
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xt_xlate_add(xl, "ip saddr%s %s",
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info->flags & IPRANGE_SRC_INV ? " !=" : "",
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xtables_ipaddr_to_numeric(&info->src_min.in));
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xt_xlate_add(xl, "-%s",
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xtables_ipaddr_to_numeric(&info->src_max.in));
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space = " ";
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}
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if (info->flags & IPRANGE_DST) {
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xt_xlate_add(xl, "%sip daddr%s %s", space,
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info->flags & IPRANGE_DST_INV ? " !=" : "",
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xtables_ipaddr_to_numeric(&info->dst_min.in));
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xt_xlate_add(xl, "-%s",
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xtables_ipaddr_to_numeric(&info->dst_max.in));
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}
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return 1;
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}
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static int iprange_mt6_xlate(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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const struct xt_iprange_mtinfo *info =
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(const void *)params->match->data;
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char *space = "";
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if (info->flags & IPRANGE_SRC) {
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xt_xlate_add(xl, "ip6 saddr%s %s",
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info->flags & IPRANGE_SRC_INV ? " !=" : "",
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xtables_ip6addr_to_numeric(&info->src_min.in6));
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xt_xlate_add(xl, "-%s",
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xtables_ip6addr_to_numeric(&info->src_max.in6));
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space = " ";
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}
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if (info->flags & IPRANGE_DST) {
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xt_xlate_add(xl, "%sip6 daddr%s %s", space,
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info->flags & IPRANGE_DST_INV ? " !=" : "",
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xtables_ip6addr_to_numeric(&info->dst_min.in6));
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xt_xlate_add(xl, "-%s",
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xtables_ip6addr_to_numeric(&info->dst_max.in6));
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}
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return 1;
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}
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static struct xtables_match iprange_mt_reg[] = {
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{
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.version = XTABLES_VERSION,
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.name = "iprange",
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.revision = 0,
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.family = NFPROTO_IPV4,
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.size = XT_ALIGN(sizeof(struct ipt_iprange_info)),
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.userspacesize = XT_ALIGN(sizeof(struct ipt_iprange_info)),
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.help = iprange_mt_help,
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.x6_parse = iprange_parse,
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.x6_fcheck = iprange_mt_check,
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.print = iprange_print,
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.save = iprange_save,
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.x6_options = iprange_mt_opts,
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.xlate = iprange_xlate,
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},
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{
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.version = XTABLES_VERSION,
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.name = "iprange",
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.revision = 1,
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.family = NFPROTO_IPV4,
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.size = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
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.help = iprange_mt_help,
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.x6_parse = iprange_mt4_parse,
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.x6_fcheck = iprange_mt_check,
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.print = iprange_mt4_print,
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.save = iprange_mt4_save,
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.x6_options = iprange_mt_opts,
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.xlate = iprange_mt4_xlate,
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},
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{
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.version = XTABLES_VERSION,
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.name = "iprange",
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.revision = 1,
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.family = NFPROTO_IPV6,
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.size = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
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.help = iprange_mt_help,
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.x6_parse = iprange_mt6_parse,
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.x6_fcheck = iprange_mt_check,
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.print = iprange_mt6_print,
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.save = iprange_mt6_save,
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.x6_options = iprange_mt_opts,
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.xlate = iprange_mt6_xlate,
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},
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};
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void _init(void)
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{
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xtables_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
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}
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