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/* Shared library to add Segment Routing Header (SRH) matching support.
*
* Author:
* Ahmed Abdelsalam <amsalam20@gmail.com>
*/
#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter_ipv6/ip6t_srh.h>
#include <string.h>
/* srh command-line options */
enum {
O_SRH_NEXTHDR,
O_SRH_LEN_EQ,
O_SRH_LEN_GT,
O_SRH_LEN_LT,
O_SRH_SEGS_EQ,
O_SRH_SEGS_GT,
O_SRH_SEGS_LT,
O_SRH_LAST_EQ,
O_SRH_LAST_GT,
O_SRH_LAST_LT,
O_SRH_TAG,
};
static void srh_help(void)
{
printf(
"srh match options:\n"
"[!] --srh-next-hdr next-hdr Next Header value of SRH\n"
"[!] --srh-hdr-len-eq hdr_len Hdr Ext Len value of SRH\n"
"[!] --srh-hdr-len-gt hdr_len Hdr Ext Len value of SRH\n"
"[!] --srh-hdr-len-lt hdr_len Hdr Ext Len value of SRH\n"
"[!] --srh-segs-left-eq segs_left Segments Left value of SRH\n"
"[!] --srh-segs-left-gt segs_left Segments Left value of SRH\n"
"[!] --srh-segs-left-lt segs_left Segments Left value of SRH\n"
"[!] --srh-last-entry-eq last_entry Last Entry value of SRH\n"
"[!] --srh-last-entry-gt last_entry Last Entry value of SRH\n"
"[!] --srh-last-entry-lt last_entry Last Entry value of SRH\n"
"[!] --srh-tag tag Tag value of SRH\n");
}
#define s struct ip6t_srh
static const struct xt_option_entry srh_opts[] = {
{ .name = "srh-next-hdr", .id = O_SRH_NEXTHDR, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, next_hdr)},
{ .name = "srh-hdr-len-eq", .id = O_SRH_LEN_EQ, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, hdr_len)},
{ .name = "srh-hdr-len-gt", .id = O_SRH_LEN_GT, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, hdr_len)},
{ .name = "srh-hdr-len-lt", .id = O_SRH_LEN_LT, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, hdr_len)},
{ .name = "srh-segs-left-eq", .id = O_SRH_SEGS_EQ, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, segs_left)},
{ .name = "srh-segs-left-gt", .id = O_SRH_SEGS_GT, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, segs_left)},
{ .name = "srh-segs-left-lt", .id = O_SRH_SEGS_LT, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, segs_left)},
{ .name = "srh-last-entry-eq", .id = O_SRH_LAST_EQ, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, last_entry)},
{ .name = "srh-last-entry-gt", .id = O_SRH_LAST_GT, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, last_entry)},
{ .name = "srh-last-entry-lt", .id = O_SRH_LAST_LT, .type = XTTYPE_UINT8,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, last_entry)},
{ .name = "srh-tag", .id = O_SRH_TAG, .type = XTTYPE_UINT16,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, tag)},
{ }
};
#undef s
static void srh_init(struct xt_entry_match *m)
{
struct ip6t_srh *srhinfo = (void *)m->data;
srhinfo->mt_flags = 0;
srhinfo->mt_invflags = 0;
}
static void srh_parse(struct xt_option_call *cb)
{
struct ip6t_srh *srhinfo = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_SRH_NEXTHDR:
srhinfo->mt_flags |= IP6T_SRH_NEXTHDR;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_NEXTHDR;
break;
case O_SRH_LEN_EQ:
srhinfo->mt_flags |= IP6T_SRH_LEN_EQ;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_LEN_EQ;
break;
case O_SRH_LEN_GT:
srhinfo->mt_flags |= IP6T_SRH_LEN_GT;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_LEN_GT;
break;
case O_SRH_LEN_LT:
srhinfo->mt_flags |= IP6T_SRH_LEN_LT;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_LEN_LT;
break;
case O_SRH_SEGS_EQ:
srhinfo->mt_flags |= IP6T_SRH_SEGS_EQ;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_SEGS_EQ;
break;
case O_SRH_SEGS_GT:
srhinfo->mt_flags |= IP6T_SRH_SEGS_GT;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_SEGS_GT;
break;
case O_SRH_SEGS_LT:
srhinfo->mt_flags |= IP6T_SRH_SEGS_LT;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_SEGS_LT;
break;
case O_SRH_LAST_EQ:
srhinfo->mt_flags |= IP6T_SRH_LAST_EQ;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_LAST_EQ;
break;
case O_SRH_LAST_GT:
srhinfo->mt_flags |= IP6T_SRH_LAST_GT;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_LAST_GT;
break;
case O_SRH_LAST_LT:
srhinfo->mt_flags |= IP6T_SRH_LAST_LT;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_LAST_LT;
break;
case O_SRH_TAG:
srhinfo->mt_flags |= IP6T_SRH_TAG;
if (cb->invert)
srhinfo->mt_invflags |= IP6T_SRH_INV_TAG;
break;
}
}
static void srh_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ip6t_srh *srhinfo = (struct ip6t_srh *)match->data;
printf(" srh");
if (srhinfo->mt_flags & IP6T_SRH_NEXTHDR)
printf(" next-hdr:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_NEXTHDR ? "!" : "",
srhinfo->next_hdr);
if (srhinfo->mt_flags & IP6T_SRH_LEN_EQ)
printf(" hdr-len-eq:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LEN_EQ ? "!" : "",
srhinfo->hdr_len);
if (srhinfo->mt_flags & IP6T_SRH_LEN_GT)
printf(" hdr-len-gt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LEN_GT ? "!" : "",
srhinfo->hdr_len);
if (srhinfo->mt_flags & IP6T_SRH_LEN_LT)
printf(" hdr-len-lt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LEN_LT ? "!" : "",
srhinfo->hdr_len);
if (srhinfo->mt_flags & IP6T_SRH_SEGS_EQ)
printf(" segs-left-eq:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_EQ ? "!" : "",
srhinfo->segs_left);
if (srhinfo->mt_flags & IP6T_SRH_SEGS_GT)
printf(" segs-left-gt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_GT ? "!" : "",
srhinfo->segs_left);
if (srhinfo->mt_flags & IP6T_SRH_SEGS_LT)
printf(" segs-left-lt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_LT ? "!" : "",
srhinfo->segs_left);
if (srhinfo->mt_flags & IP6T_SRH_LAST_EQ)
printf(" last-entry-eq:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LAST_EQ ? "!" : "",
srhinfo->last_entry);
if (srhinfo->mt_flags & IP6T_SRH_LAST_GT)
printf(" last-entry-gt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LAST_GT ? "!" : "",
srhinfo->last_entry);
if (srhinfo->mt_flags & IP6T_SRH_LAST_LT)
printf(" last-entry-lt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LAST_LT ? "!" : "",
srhinfo->last_entry);
if (srhinfo->mt_flags & IP6T_SRH_TAG)
printf(" tag:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_TAG ? "!" : "",
srhinfo->tag);
}
static void srh_save(const void *ip, const struct xt_entry_match *match)
{
const struct ip6t_srh *srhinfo = (struct ip6t_srh *)match->data;
if (srhinfo->mt_flags & IP6T_SRH_NEXTHDR)
printf("%s --srh-next-hdr %u", (srhinfo->mt_invflags & IP6T_SRH_INV_NEXTHDR) ? " !" : "",
srhinfo->next_hdr);
if (srhinfo->mt_flags & IP6T_SRH_LEN_EQ)
printf("%s --srh-hdr-len-eq %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LEN_EQ) ? " !" : "",
srhinfo->hdr_len);
if (srhinfo->mt_flags & IP6T_SRH_LEN_GT)
printf("%s --srh-hdr-len-gt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LEN_GT) ? " !" : "",
srhinfo->hdr_len);
if (srhinfo->mt_flags & IP6T_SRH_LEN_LT)
printf("%s --srh-hdr-len-lt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LEN_LT) ? " !" : "",
srhinfo->hdr_len);
if (srhinfo->mt_flags & IP6T_SRH_SEGS_EQ)
printf("%s --srh-segs-left-eq %u", (srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_EQ) ? " !" : "",
srhinfo->segs_left);
if (srhinfo->mt_flags & IP6T_SRH_SEGS_GT)
printf("%s --srh-segs-left-gt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_GT) ? " !" : "",
srhinfo->segs_left);
if (srhinfo->mt_flags & IP6T_SRH_SEGS_LT)
printf("%s --srh-segs-left-lt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_LT) ? " !" : "",
srhinfo->segs_left);
if (srhinfo->mt_flags & IP6T_SRH_LAST_EQ)
printf("%s --srh-last-entry-eq %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LAST_EQ) ? " !" : "",
srhinfo->last_entry);
if (srhinfo->mt_flags & IP6T_SRH_LAST_GT)
printf("%s --srh-last-entry-gt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LAST_GT) ? " !" : "",
srhinfo->last_entry);
if (srhinfo->mt_flags & IP6T_SRH_LAST_LT)
printf("%s --srh-last-entry-lt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LAST_LT) ? " !" : "",
srhinfo->last_entry);
if (srhinfo->mt_flags & IP6T_SRH_TAG)
printf("%s --srh-tag %u", (srhinfo->mt_invflags & IP6T_SRH_INV_TAG) ? " !" : "",
srhinfo->tag);
}
static struct xtables_match srh_mt6_reg = {
.name = "srh",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct ip6t_srh)),
.userspacesize = XT_ALIGN(sizeof(struct ip6t_srh)),
.help = srh_help,
.init = srh_init,
.print = srh_print,
.save = srh_save,
.x6_parse = srh_parse,
.x6_options = srh_opts,
};
void
_init(void)
{
xtables_register_match(&srh_mt6_reg);
}
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